Combine a tag-functionality assessment (dominant gate), a Poisson base rate from Contender's historical inter-ping intervals over a ~45-day window, and seasonal surfacing/habitat considerations into a weighted average, anchored on the empirical fact that Ocearch sharks with live tags typically ping multiple times per summer.
## Cross-Market Signals ### No signal found
1. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] OCEARCH tracker recorded a Z-ping for Contender on July 22, 2026 at 2:13 AM, confirming the tag was still transmitting after July 18. 2. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] A Z-ping on July 10-11, 2026 confirmed Contender alive and the SPOT tag attached and functioning after a months-long silence. 3. [sq2 | web_search | STRONG cred 82 | DOWN | RECENT] Contender's most recent full location ping before mid-July 2026 was April 23, 2026 near the Outer Banks — roughly an 11-week gap with no located ping. 4. [sq2 | web_search | WEAK cred 45 | NEUTRAL | VERY_RECENT] Some outlets reported the tag transmitted a location at 4:56 p.m. on July 16, 2026, though other reports describe mid-July transmissions as Z-pings only. 5. [sq2 | web_search | MODERATE cred 60 | UP | VERY_RECENT] Tracker shows Contender tagged 540 days with 8,234 miles logged (vs ~7,100 miles cited earlier in July), implying continued distance accrual between location fixes. 6. [sq2 | web_search | MODERATE cred 78 | DOWN | RECENT] Contender's 2026 ping record shows long silences: no detections between late April and July 10, 2026. 7. [sq3 | web_search | MODERATE cred 75 | UP | VERY_RECENT] OCEARCH and multiple outlets state Contender is making his annual northward summer migration toward Cape Cod and eastern Canada. 8. [sq3 | web_search | WEAK cred 50 | NEUTRAL | VERY_RECENT] No confirmed Cape Cod or located August 2026 ping for Contender appeared in search results as of late July 2026. 9. [sq3 | article_search | WEAK cred 70 | NEUTRAL | RECENT] Great white activity in the Northwest Atlantic summer range is documented, including a large white shark feeding on a humpback carcass off Rhode Island in July 2026. 10. [sq1 | web_search | MODERATE cred 88 | NEUTRAL | RECENT] OCEARCH's Dr. Robert Hueter explains a good location fix requires 10-30 seconds of continuous surface time; brief surfacings yield only Z-pings. 11. [sq1 | web_search | MODERATE cred 70 | NEUTRAL | VERY_RECENT] Contender's SPOT tag has been deployed ~18 months (since January 17, 2025), within but approaching typical multi-year SPOT tag battery/attachment lifespan. 12. [sq2 | article_search | WEAK cred 40 | NEUTRAL | VERY_RECENT] No article in the search corpus provided Contender's full historical ping log or inter-ping interval distribution since tagging. ## Cross-Market Signals ### No signal found Information gaps: - Full Contender ping log with dates/types since Jan 2025 (base rate of located pings per 6-week window) - Whether the reported July 16, 2026 4:56 p.m. transmission was a true located ping or a Z-ping - OCEARCH fleet-wide base rate: fraction of active-tag white sharks producing ≥1 located ping in July-August - Any tracker updates after July 22, 2026 Key uncertainties: - Whether tag attachment/battery degrades further before September 1 - Whether recent Z-ping-only pattern reflects tag weakening vs. brief surfacing behavior - Whether Contender enters shallow surface-active Cape Cod/Maritimes habitat in time - Conflicting reports on July 2026 ping classification
You are an elite superforecaster using Tetlock-style Fermi decomposition. Estimate each sub-question INDEPENDENTLY, then provide a holistic estimate. The pipeline will mathematically recombine the sub-question estimates — your job is to give the most accurate per-component probabilities.
## Question
Will Ocearch successfully ping Contender, the Atlantic's largest great white shark, before September 1, 2026?
## Description / Resolution Criteria
## Description
*(Image courtesy of Ocearch.)*
NY Post: [1,700lb great white shark ‘Contender’ — biggest ever recorded in Atlantic — believed to be heading to summer hotspot](https://nypost.com/2026/07/15/us-news/1700lb-great-white-shark-contender-biggest-ever-recorded-in-atlantic-believed-to-be-heading-to-cape-cod/)
> The largest great white shark ever discovered in the Atlantic Ocean was spotted for the first time in months and is most likely heading toward Cape Cod and then the eastern coast of Canada, according to a group that researches the apex predators.
> The 14-foot, 1,700-pound male shark named “Contender” was last spotted near the Outer Banks of North Carolina and is believed to be heading north towards the popular Massachusetts summer destination, [according to OCEARCH’s shark tracker](https://www.ocearch.org/tracker/detail/contender)
Fox Weather: [Contender's latest ping reveals the location of the Atlantic’s largest recorded male great white is a mystery](https://www.foxweather.com/earth-space/contenders-latest-ping-reveals-location-atlantics-largest-recorded-male-great-white-mystery)
> According to OCEARCH, when a shark is tagged, a SPOT satellite tag is attached to its dorsal fin.
> The device utilizes two copper contacts that form a closed circuit underwater. When the shark breaks the surface, the circuit is broken, which "wakes up" the tag to transmit a location signal.
> "If the shark stays at the surface for 10, 20, 30 seconds, we'll get a good fix on where the shark is," OCEARCH Chief Scientist Dr. Robert Hueter said.
> However, if it is only a quick, transient transmission, it is classified as a Z-ping. This tells researchers that the shark surfaced, but the signal was too brief to calculate its coordinates.
`{"format": "metac_reveal_and_close_in_period", "info": {"post_id": 44673, "question_id": 44832}}`
## Resolution Criteria
This question resolves as **Yes** if, according to the Ocearch [Contender tracker,](https://www.ocearch.org/tracker/detail/contender) there is a ping with a date after July 18, 2026 and before September 1, 2026. 
Please note that a Z-ping does *not* count. According to Ocearch, "A Z-ping happens when the shark spends only a brief period of time at the surface. The signal is sent and received by an Argos satellite but it's not strong enough to determine an accurate location."
## Fine Print
This question's information (resolution criteria, fine print, background info, etc) is synced with an [original identical question](https://www.metaculus.com/questions/44673) which opened on 2026-07-16 09:00:00. This question will resolve based on the resolution criteria and fine print of the linked original question. However, if this question would resolve differently than the original question, then this question will be annulled. Additionally, if the original question's resolution could have been known before this question opened, then this question will be annulled.
## Sub-question decomposition
- (w=0.40) Is Contender's SPOT tag still functioning and attached (i.e., has it produced at least one location ping or Z-ping within the ~60 days before July 18, 2026)? — Tag functionality/retention is the dominant driver; if the tag has failed or detached, no further pings are possible.
- (w=0.35) Based on Contender's historical ping frequency since tagging in January 2025, would the expected number of location pings in a ~6-week window exceed one? — Base-rate of ping intervals directly gives the probability of at least one qualifying ping in the July 18 – Sept 1 windo
- (w=0.25) Will Contender be in surface-active summer foraging habitat (Cape Cod / Canadian Maritimes) during the window, where pings historically cluster? — Surfacing behavior and satellite coverage vary by season/region; northern summer foraging grounds have historically prod
Combination rule: **weighted_average**
## Synthesized evidence
1. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] OCEARCH tracker recorded a Z-ping for Contender on July 22, 2026 at 2:13 AM, confirming the tag was still transmitting after July 18.
2. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] A Z-ping on July 10-11, 2026 confirmed Contender alive and the SPOT tag attached and functioning after a months-long silence.
3. [sq2 | web_search | STRONG cred 82 | DOWN | RECENT] Contender's most recent full location ping before mid-July 2026 was April 23, 2026 near the Outer Banks — roughly an 11-week gap with no located ping.
4. [sq2 | web_search | WEAK cred 45 | NEUTRAL | VERY_RECENT] Some outlets reported the tag transmitted a location at 4:56 p.m. on July 16, 2026, though other reports describe mid-July transmissions as Z-pings only.
5. [sq2 | web_search | MODERATE cred 60 | UP | VERY_RECENT] Tracker shows Contender tagged 540 days with 8,234 miles logged (vs ~7,100 miles cited earlier in July), implying continued distance accrual between location fixes.
6. [sq2 | web_search | MODERATE cred 78 | DOWN | RECENT] Contender's 2026 ping record shows long silences: no detections between late April and July 10, 2026.
7. [sq3 | web_search | MODERATE cred 75 | UP | VERY_RECENT] OCEARCH and multiple outlets state Contender is making his annual northward summer migration toward Cape Cod and eastern Canada.
8. [sq3 | web_search | WEAK cred 50 | NEUTRAL | VERY_RECENT] No confirmed Cape Cod or located August 2026 ping for Contender appeared in search results as of late July 2026.
9. [sq3 | article_search | WEAK cred 70 | NEUTRAL | RECENT] Great white activity in the Northwest Atlantic summer range is documented, including a large white shark feeding on a humpback carcass off Rhode Island in July 2026.
10. [sq1 | web_search | MODERATE cred 88 | NEUTRAL | RECENT] OCEARCH's Dr. Robert Hueter explains a good location fix requires 10-30 seconds of continuous surface time; brief surfacings yield only Z-pings.
11. [sq1 | web_search | MODERATE cred 70 | NEUTRAL | VERY_RECENT] Contender's SPOT tag has been deployed ~18 months (since January 17, 2025), within but approaching typical multi-year SPOT tag battery/attachment lifespan.
12. [sq2 | article_search | WEAK cred 40 | NEUTRAL | VERY_RECENT] No article in the search corpus provided Contender's full historical ping log or inter-ping interval distribution since tagging.
## Cross-Market Signals
### No signal found
Information gaps:
- Full Contender ping log with dates/types since Jan 2025 (base rate of located pings per 6-week window)
- Whether the reported July 16, 2026 4:56 p.m. transmission was a true located ping or a Z-ping
- OCEARCH fleet-wide base rate: fraction of active-tag white sharks producing ≥1 located ping in July-August
- Any tracker updates after July 22, 2026
Key uncertainties:
- Whether tag attachment/battery degrades further before September 1
- Whether recent Z-ping-only pattern reflects tag weakening vs. brief surfacing behavior
- Whether Contender enters shallow surface-active Cape Cod/Maritimes habitat in time
- Conflicting reports on July 2026 ping classification
## Required pre-forecast walkthrough
Before giving probabilities, walk through these explicitly:
(a) The time left until the question resolves.
(b) The status quo outcome — what happens if nothing changes from today.
(c) A brief scenario that results in NO.
(d) A brief scenario that results in YES.
## Calibration guidance
- **Estimate each sub-question in isolation.** Do not let your answer to one sub-question anchor your answer to another. This is the core of Fermi decomposition — independence forces more careful reasoning per factor.
- **Anchor on the status quo.** Require strong specific evidence to move far from it.
- 0.05 / 0.95 require strong, multi-source evidence. Avoid >0.97 or <0.03 unless the outcome is already settled or near-tautological — overconfident misses are punished heavily by the log score.
- **Anchor on prediction markets.** If liquid market prices (Polymarket / Kalshi) or a community forecast appear in the evidence, treat them as a strong, well-calibrated prior. Your final estimate should rarely sit more than ~15 percentage points from a liquid market on the SAME question — move further only with specific evidence the market lacks.
- **Treat research as fallible, not ground truth.** A single-source or "very recent" claim — especially one the evidence flags as unverified, possibly AI-generated, or low-credibility — must not drive you to near-certainty. When a load-bearing fact is unverified, keep at least 10-15% on the chance it is wrong.
- **Also provide a holistic estimate** — your overall gut feeling about the main question, BEFORE you see the mathematical combination. This serves as a sanity check: if the Fermi result and holistic estimate diverge wildly, something is wrong.
## Output
Return ONLY valid JSON, no markdown fences:
{
"rationale": "<address (a) (b) (c) (d) above — 5-8 sentences total>",
"sub_question_estimates": {
"sq1": <float in [0.01, 0.99]>,
"sq2": <float in [0.01, 0.99]>,
"sq3": <float in [0.01, 0.99]>
},
"holistic_p_yes": <float in [0.01, 0.99] — your overall estimate ignoring the decomposition>,
"what_would_change_my_mind": "<1-2 sentences: what new info would push you above 70% or below 30%>"
}
{
"forecast": {
"combination_logic": "weighted_average",
"evidence_brief": "1. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] OCEARCH tracker recorded a Z-ping for Contender on July 22, 2026 at 2:13 AM, confirming the tag was still transmitting after July 18.\n2. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] A Z-ping on July 10-11, 2026 confirmed Contender alive and the SPOT tag attached and functioning after a months-long silence.\n3. [sq2 | web_search | STRONG cred 82 | DOWN | RECENT] Contender\u0027s most recent full location ping before mid-July 2026 was April 23, 2026 near the Outer Banks \u2014 roughly an 11-week gap with no located ping.\n4. [sq2 | web_search | WEAK cred 45 | NEUTRAL | VERY_RECENT] Some outlets reported the tag transmitted a location at 4:56 p.m. on July 16, 2026, though other reports describe mid-July transmissions as Z-pings only.\n5. [sq2 | web_search | MODERATE cred 60 | UP | VERY_RECENT] Tracker shows Contender tagged 540 days with 8,234 miles logged (vs ~7,100 miles cited earlier in July), implying continued distance accrual between location fixes.\n6. [sq2 | web_search | MODERATE cred 78 | DOWN | RECENT] Contender\u0027s 2026 ping record shows long silences: no detections between late April and July 10, 2026.\n7. [sq3 | web_search | MODERATE cred 75 | UP | VERY_RECENT] OCEARCH and multiple outlets state Contender is making his annual northward summer migration toward Cape Cod and eastern Canada.\n8. [sq3 | web_search | WEAK cred 50 | NEUTRAL | VERY_RECENT] No confirmed Cape Cod or located August 2026 ping for Contender appeared in search results as of late July 2026.\n9. [sq3 | article_search | WEAK cred 70 | NEUTRAL | RECENT] Great white activity in the Northwest Atlantic summer range is documented, including a large white shark feeding on a humpback carcass off Rhode Island in July 2026.\n10. [sq1 | web_search | MODERATE cred 88 | NEUTRAL | RECENT] OCEARCH\u0027s Dr. Robert Hueter explains a good location fix requires 10-30 seconds of continuous surface time; brief surfacings yield only Z-pings.\n11. [sq1 | web_search | MODERATE cred 70 | NEUTRAL | VERY_RECENT] Contender\u0027s SPOT tag has been deployed ~18 months (since January 17, 2025), within but approaching typical multi-year SPOT tag battery/attachment lifespan.\n12. [sq2 | article_search | WEAK cred 40 | NEUTRAL | VERY_RECENT] No article in the search corpus provided Contender\u0027s full historical ping log or inter-ping interval distribution since tagging.\n\n## Cross-Market Signals\n\n### No signal found\n\nInformation gaps:\n - Full Contender ping log with dates/types since Jan 2025 (base rate of located pings per 6-week window)\n - Whether the reported July 16, 2026 4:56 p.m. transmission was a true located ping or a Z-ping\n - OCEARCH fleet-wide base rate: fraction of active-tag white sharks producing \u22651 located ping in July-August\n - Any tracker updates after July 22, 2026\n\nKey uncertainties:\n - Whether tag attachment/battery degrades further before September 1\n - Whether recent Z-ping-only pattern reflects tag weakening vs. brief surfacing behavior\n - Whether Contender enters shallow surface-active Cape Cod/Maritimes habitat in time\n - Conflicting reports on July 2026 ping classification",
"forecast_prompt": "You are an elite superforecaster using Tetlock-style Fermi decomposition. Estimate each sub-question INDEPENDENTLY, then provide a holistic estimate. The pipeline will mathematically recombine the sub-question estimates \u2014 your job is to give the most accurate per-component probabilities.\n\n## Question\nWill Ocearch successfully ping Contender, the Atlantic\u0027s largest great white shark, before September 1, 2026?\n\n## Description / Resolution Criteria\n## Description\n*(Image courtesy of Ocearch.)*\n\nNY Post: [1,700lb great white shark \u2018Contender\u2019 \u2014 biggest ever recorded in Atlantic \u2014 believed to be heading to summer hotspot](https://nypost.com/2026/07/15/us-news/1700lb-great-white-shark-contender-biggest-ever-recorded-in-atlantic-believed-to-be-heading-to-cape-cod/)\n\n\u003e The largest great white shark ever discovered in the Atlantic Ocean was spotted for the first time in months and is most likely heading toward Cape Cod and then the eastern coast of Canada, according to a group that researches the apex predators.\n\n\u003e The 14-foot, 1,700-pound male shark named \u201cContender\u201d was last spotted near the Outer Banks of North Carolina and is believed to be heading north towards the popular Massachusetts summer destination, [according to OCEARCH\u2019s shark tracker](https://www.ocearch.org/tracker/detail/contender)\n\nFox Weather: [Contender\u0027s latest ping reveals the location of the Atlantic\u2019s largest recorded male great white is a mystery](https://www.foxweather.com/earth-space/contenders-latest-ping-reveals-location-atlantics-largest-recorded-male-great-white-mystery)\n\n\u003e According to OCEARCH, when a shark is tagged, a SPOT satellite tag is attached to its dorsal fin.\n\n\u003e The device utilizes two copper contacts that form a closed circuit underwater. When the shark breaks the surface, the circuit is broken, which \"wakes up\" the tag to transmit a location signal.\n\n\u003e \"If the shark stays at the surface for 10, 20, 30 seconds, we\u0027ll get a good fix on where the shark is,\" OCEARCH Chief Scientist Dr. Robert Hueter said.\n\n\u003e However, if it is only a quick, transient transmission, it is classified as a Z-ping. This tells researchers that the shark surfaced, but the signal was too brief to calculate its coordinates.\n\n`{\"format\": \"metac_reveal_and_close_in_period\", \"info\": {\"post_id\": 44673, \"question_id\": 44832}}`\n\n## Resolution Criteria\nThis question resolves as **Yes** if, according to the Ocearch [Contender tracker,](https://www.ocearch.org/tracker/detail/contender) there is a ping with a date after July 18, 2026 and before September 1, 2026.\u0026#x20;\n\nPlease note that a Z-ping does *not* count. According to Ocearch, \"A Z-ping happens when the shark spends only a brief period of time at the surface. The signal is sent and received by an Argos satellite but it\u0027s not strong enough to determine an accurate location.\"\n\n## Fine Print\nThis question\u0027s information (resolution criteria, fine print, background info, etc) is synced with an [original identical question](https://www.metaculus.com/questions/44673) which opened on 2026-07-16 09:00:00. This question will resolve based on the resolution criteria and fine print of the linked original question. However, if this question would resolve differently than the original question, then this question will be annulled. Additionally, if the original question\u0027s resolution could have been known before this question opened, then this question will be annulled.\n\n## Sub-question decomposition\n- (w=0.40) Is Contender\u0027s SPOT tag still functioning and attached (i.e., has it produced at least one location ping or Z-ping within the ~60 days before July 18, 2026)? \u2014 Tag functionality/retention is the dominant driver; if the tag has failed or detached, no further pings are possible.\n- (w=0.35) Based on Contender\u0027s historical ping frequency since tagging in January 2025, would the expected number of location pings in a ~6-week window exceed one? \u2014 Base-rate of ping intervals directly gives the probability of at least one qualifying ping in the July 18 \u2013 Sept 1 windo\n- (w=0.25) Will Contender be in surface-active summer foraging habitat (Cape Cod / Canadian Maritimes) during the window, where pings historically cluster? \u2014 Surfacing behavior and satellite coverage vary by season/region; northern summer foraging grounds have historically prod\n\nCombination rule: **weighted_average**\n\n## Synthesized evidence\n1. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] OCEARCH tracker recorded a Z-ping for Contender on July 22, 2026 at 2:13 AM, confirming the tag was still transmitting after July 18.\n2. [sq1 | web_search | STRONG cred 85 | UP | VERY_RECENT] A Z-ping on July 10-11, 2026 confirmed Contender alive and the SPOT tag attached and functioning after a months-long silence.\n3. [sq2 | web_search | STRONG cred 82 | DOWN | RECENT] Contender\u0027s most recent full location ping before mid-July 2026 was April 23, 2026 near the Outer Banks \u2014 roughly an 11-week gap with no located ping.\n4. [sq2 | web_search | WEAK cred 45 | NEUTRAL | VERY_RECENT] Some outlets reported the tag transmitted a location at 4:56 p.m. on July 16, 2026, though other reports describe mid-July transmissions as Z-pings only.\n5. [sq2 | web_search | MODERATE cred 60 | UP | VERY_RECENT] Tracker shows Contender tagged 540 days with 8,234 miles logged (vs ~7,100 miles cited earlier in July), implying continued distance accrual between location fixes.\n6. [sq2 | web_search | MODERATE cred 78 | DOWN | RECENT] Contender\u0027s 2026 ping record shows long silences: no detections between late April and July 10, 2026.\n7. [sq3 | web_search | MODERATE cred 75 | UP | VERY_RECENT] OCEARCH and multiple outlets state Contender is making his annual northward summer migration toward Cape Cod and eastern Canada.\n8. [sq3 | web_search | WEAK cred 50 | NEUTRAL | VERY_RECENT] No confirmed Cape Cod or located August 2026 ping for Contender appeared in search results as of late July 2026.\n9. [sq3 | article_search | WEAK cred 70 | NEUTRAL | RECENT] Great white activity in the Northwest Atlantic summer range is documented, including a large white shark feeding on a humpback carcass off Rhode Island in July 2026.\n10. [sq1 | web_search | MODERATE cred 88 | NEUTRAL | RECENT] OCEARCH\u0027s Dr. Robert Hueter explains a good location fix requires 10-30 seconds of continuous surface time; brief surfacings yield only Z-pings.\n11. [sq1 | web_search | MODERATE cred 70 | NEUTRAL | VERY_RECENT] Contender\u0027s SPOT tag has been deployed ~18 months (since January 17, 2025), within but approaching typical multi-year SPOT tag battery/attachment lifespan.\n12. [sq2 | article_search | WEAK cred 40 | NEUTRAL | VERY_RECENT] No article in the search corpus provided Contender\u0027s full historical ping log or inter-ping interval distribution since tagging.\n\n## Cross-Market Signals\n\n### No signal found\n\nInformation gaps:\n - Full Contender ping log with dates/types since Jan 2025 (base rate of located pings per 6-week window)\n - Whether the reported July 16, 2026 4:56 p.m. transmission was a true located ping or a Z-ping\n - OCEARCH fleet-wide base rate: fraction of active-tag white sharks producing \u22651 located ping in July-August\n - Any tracker updates after July 22, 2026\n\nKey uncertainties:\n - Whether tag attachment/battery degrades further before September 1\n - Whether recent Z-ping-only pattern reflects tag weakening vs. brief surfacing behavior\n - Whether Contender enters shallow surface-active Cape Cod/Maritimes habitat in time\n - Conflicting reports on July 2026 ping classification\n\n## Required pre-forecast walkthrough\n\nBefore giving probabilities, walk through these explicitly:\n (a) The time left until the question resolves.\n (b) The status quo outcome \u2014 what happens if nothing changes from today.\n (c) A brief scenario that results in NO.\n (d) A brief scenario that results in YES.\n\n## Calibration guidance\n\n- **Estimate each sub-question in isolation.** Do not let your answer to one sub-question anchor your answer to another. This is the core of Fermi decomposition \u2014 independence forces more careful reasoning per factor.\n- **Anchor on the status quo.** Require strong specific evidence to move far from it.\n- 0.05 / 0.95 require strong, multi-source evidence. Avoid \u003e0.97 or \u003c0.03 unless the outcome is already settled or near-tautological \u2014 overconfident misses are punished heavily by the log score.\n- **Anchor on prediction markets.** If liquid market prices (Polymarket / Kalshi) or a community forecast appear in the evidence, treat them as a strong, well-calibrated prior. Your final estimate should rarely sit more than ~15 percentage points from a liquid market on the SAME question \u2014 move further only with specific evidence the market lacks.\n- **Treat research as fallible, not ground truth.** A single-source or \"very recent\" claim \u2014 especially one the evidence flags as unverified, possibly AI-generated, or low-credibility \u2014 must not drive you to near-certainty. When a load-bearing fact is unverified, keep at least 10-15% on the chance it is wrong.\n- **Also provide a holistic estimate** \u2014 your overall gut feeling about the main question, BEFORE you see the mathematical combination. This serves as a sanity check: if the Fermi result and holistic estimate diverge wildly, something is wrong.\n\n## Output\n\nReturn ONLY valid JSON, no markdown fences:\n\n{\n \"rationale\": \"\u003caddress (a) (b) (c) (d) above \u2014 5-8 sentences total\u003e\",\n \"sub_question_estimates\": {\n \"sq1\": \u003cfloat in [0.01, 0.99]\u003e,\n \"sq2\": \u003cfloat in [0.01, 0.99]\u003e,\n \"sq3\": \u003cfloat in [0.01, 0.99]\u003e\n },\n \"holistic_p_yes\": \u003cfloat in [0.01, 0.99] \u2014 your overall estimate ignoring the decomposition\u003e,\n \"what_would_change_my_mind\": \"\u003c1-2 sentences: what new info would push you above 70% or below 30%\u003e\"\n}\n",
"holistic_p_yes": 0.6,
"models": [
"opus"
],
"p_yes": 0.6645,
"rationale": "(a) The window runs from July 18 to September 1, 2026 \u2014 about six weeks, of which roughly the first week has already elapsed as of the latest evidence (a July 22 Z-ping). (b) Status quo: the tag is demonstrably alive (Z-pings July 10-11 and July 22, 2026) but has been producing only brief, unlocatable transmissions since the last confirmed full location fix around April 23, 2026 \u2014 an ~11-week located-ping drought; if that pattern simply continues, the question resolves NO. (c) NO scenario: Contender continues offshore, deep-water travel with only fleeting surfacings, generating Z-pings but never the 10-30 continuous surface seconds needed for an Argos fix; or the tag\u0027s transmission power/attachment degrades further after 19 months of deployment. (d) YES scenario: he completes the northward migration into the shallow, seal-rich Cape Cod/Gulf of Maine/Maritimes foraging grounds where white sharks patrol near the surface and Argos satellite passes are dense at high latitudes, yielding at least one clean located ping \u2014 historically his most ping-productive season/region. Tag functionality is essentially confirmed, so the crux is behavioral: whether he surfaces long enough. Recent history is genuinely discouraging (long silences in 2026, conflicting reporting on whether mid-July transmissions were located pings), which offsets the seasonal tailwind. Net, I land modestly above even odds.",
"sub_question_estimates": {
"sq1": 0.95,
"sq2": 0.45,
"sq3": 0.68
},
"what_would_change_my_mind": "A confirmed located ping (with coordinates plotted, not a Z-ping) on the OCEARCH tracker after July 18 would push me above 90%; conversely, evidence that the tracker shows only Z-pings through mid-August, or that OCEARCH suspects tag transmitter degradation, would push me below 30%."
},
"plan": {
"combination_logic": "weighted_average",
"domain": "science",
"n_sub_qs": 3,
"n_tools": 4,
"reasoning_approach": "Combine a tag-functionality assessment (dominant gate), a Poisson base rate from Contender\u0027s historical inter-ping intervals over a ~45-day window, and seasonal surfacing/habitat considerations into a weighted average, anchored on the empirical fact that Ocearch sharks with live tags typically ping multiple times per summer.",
"sub_questions": [
{
"id": "sq1",
"question": "Is Contender\u0027s SPOT tag still functioning and attached (i.e., has it produced at least one location ping or Z-ping within the ~60 days before July 18, 2026)?",
"rationale": "Tag functionality/retention is the dominant driver; if the tag has failed or detached, no further pings are possible.",
"weight": 0.4
},
{
"id": "sq2",
"question": "Based on Contender\u0027s historical ping frequency since tagging in January 2025, would the expected number of location pings in a ~6-week window exceed one?",
"rationale": "Base-rate of ping intervals directly gives the probability of at least one qualifying ping in the July 18 \u2013 Sept 1 window.",
"weight": 0.35
},
{
"id": "sq3",
"question": "Will Contender be in surface-active summer foraging habitat (Cape Cod / Canadian Maritimes) during the window, where pings historically cluster?",
"rationale": "Surfacing behavior and satellite coverage vary by season/region; northern summer foraging grounds have historically produced frequent pings for Ocearch white sharks.",
"weight": 0.25
}
],
"tool_requests": [
{
"parameters": {
"queries": [
"Contender great white shark ping OCEARCH tracker latest",
"OCEARCH Contender shark surfaced July 2026",
"Contender shark tracker Cape Cod ping August 2026"
]
},
"target_sub_questions": [
"sq1",
"sq3"
],
"tool_name": "web_search"
},
{
"parameters": {
"brief": "Find the most recent OCEARCH tracker ping history for the great white shark \u0027Contender\u0027 (tagged January 2025 off Georgia/Florida). Determine: (1) the dates of all known location pings in 2025 and 2026, especially the most recent ping before and after July 18, 2026; (2) whether the tag appears to still be functioning or if there have been long gaps/Z-pings only; (3) reports of Contender\u0027s location in summer 2026 (Outer Banks, Cape Cod, Canada). Note news coverage often reports each ping.",
"max_searches": 5,
"question_title": "Will Ocearch successfully ping Contender, the Atlantic\u0027s largest great white shark, before September 1, 2026?"
},
"target_sub_questions": [
"sq1",
"sq2",
"sq3"
],
"tool_name": "claude_news"
},
{
"parameters": {
"lookback_days": 120,
"queries": [
"Contender great white shark OCEARCH ping",
"Contender shark tracker location",
"great white shark Contender Cape Cod"
]
},
"target_sub_questions": [
"sq1",
"sq2",
"sq3"
],
"tool_name": "article_search"
},
{
"parameters": {
"code": "import numpy as np\n# Estimate P(at least one location ping in 45-day window) given historical mean gap between pings\nfor mean_gap in [7,14,21,30,45,60,90,120]:\n lam = 45/mean_gap\n print(mean_gap, round(1-np.exp(-lam),3))\n# Also model tag-failure scenario: p = p_tag_alive * P(ping|alive)\nfor p_alive in [0.6,0.7,0.8,0.9]:\n for mg in [21,45,90]:\n print(\u0027alive\u0027,p_alive,\u0027gap\u0027,mg, round(p_alive*(1-np.exp(-45/mg)),3))",
"description": "Poisson base-rate for at least one location ping in the ~45-day resolution window under varying mean inter-ping gaps and tag-survival probabilities."
},
"target_sub_questions": [
"sq2"
],
"tool_name": "code_execution"
}
]
},
"question": {
"close_time": "2026-07-25T09:00:00Z",
"description": "## Description\n*(Image courtesy of Ocearch.)*\n\nNY Post: [1,700lb great white shark \u2018Contender\u2019 \u2014 biggest ever recorded in Atlantic \u2014 believed to be heading to summer hotspot](https://nypost.com/2026/07/15/us-news/1700lb-great-white-shark-contender-biggest-ever-recorded-in-atlantic-believed-to-be-heading-to-cape-cod/)\n\n\u003e The largest great white shark ever discovered in the Atlantic Ocean was spotted for the first time in months and is most likely heading toward Cape Cod and then the eastern coast of Canada, according to a group that researches the apex predators.\n\n\u003e The 14-foot, 1,700-pound male shark named \u201cContender\u201d was last spotted near the Outer Banks of North Carolina and is believed to be heading north towards the popular Massachusetts summer destination, [according to OCEARCH\u2019s shark tracker](https://www.ocearch.org/tracker/detail/contender)\n\nFox Weather: [Contender\u0027s latest ping reveals the location of the Atlantic\u2019s largest recorded male great white is a mystery](https://www.foxweather.com/earth-space/contenders-latest-ping-reveals-location-atlantics-largest-recorded-male-great-white-mystery)\n\n\u003e According to OCEARCH, when a shark is tagged, a SPOT satellite tag is attached to its dorsal fin.\n\n\u003e The device utilizes two copper contacts that form a closed circuit underwater. When the shark breaks the surface, the circuit is broken, which \"wakes up\" the tag to transmit a location signal.\n\n\u003e \"If the shark stays at the surface for 10, 20, 30 seconds, we\u0027ll get a good fix on where the shark is,\" OCEARCH Chief Scientist Dr. Robert Hueter said.\n\n\u003e However, if it is only a quick, transient transmission, it is classified as a Z-ping. This tells researchers that the shark surfaced, but the signal was too brief to calculate its coordinates.\n\n`{\"format\": \"metac_reveal_and_close_in_period\", \"info\": {\"post_id\": 44673, \"question_id\": 44832}}`\n\n## Resolution Criteria\nThis question resolves as **Yes** if, according to the Ocearch [Contender tracker,](https://www.ocearch.org/tracker/detail/contender) there is a ping with a date after July 18, 2026 and before September 1, 2026.\u0026#x20;\n\nPlease note that a Z-ping does *not* count. According to Ocearch, \"A Z-ping happens when the shark spends only a brief period of time at the surface. The signal is sent and received by an Argos satellite but it\u0027s not strong enough to determine an accurate location.\"\n\n## Fine Print\nThis question\u0027s information (resolution criteria, fine print, background info, etc) is synced with an [original identical question](https://www.metaculus.com/questions/44673) which opened on 2026-07-16 09:00:00. This question will resolve based on the resolution criteria and fine print of the linked original question. However, if this question would resolve differently than the original question, then this question will be annulled. Additionally, if the original question\u0027s resolution could have been known before this question opened, then this question will be annulled.",
"question_type": "binary",
"title": "Will Ocearch successfully ping Contender, the Atlantic\u0027s largest great white shark, before September 1, 2026?"
},
"research": {
"cross_market_brief": "## Cross-Market Signals\n\n### No signal found",
"errors": [],
"has_cross_market": true,
"n_errors": 0,
"n_tools": 4,
"tools": [
{
"elapsed_s": 22.48,
"error": null,
"success": true,
"summary": "0 results",
"tool_name": "web_search"
},
{
"elapsed_s": 32.03,
"error": null,
"success": true,
"summary": "14 citations",
"tool_name": "claude_news"
},
{
"elapsed_s": 0.59,
"error": null,
"success": true,
"summary": "15 articles",
"tool_name": "article_search"
},
{
"elapsed_s": 0.0,
"error": null,
"success": true,
"summary": "Poisson base-rate for at least one location ping in the ~45-",
"tool_name": "code_execution"
}
]
},
"synthesis": {
"evidence": [
{
"claim": "OCEARCH tracker recorded a Z-ping for Contender on July 22, 2026 at 2:13 AM, confirming the tag was still transmitting after July 18.",
"credibility": 85,
"direction": "UP",
"priced_in": false,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "STRONG",
"sub_question_id": "sq1"
},
{
"claim": "A Z-ping on July 10-11, 2026 confirmed Contender alive and the SPOT tag attached and functioning after a months-long silence.",
"credibility": 85,
"direction": "UP",
"priced_in": true,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "STRONG",
"sub_question_id": "sq1"
},
{
"claim": "Contender\u0027s most recent full location ping before mid-July 2026 was April 23, 2026 near the Outer Banks \u2014 roughly an 11-week gap with no located ping.",
"credibility": 82,
"direction": "DOWN",
"priced_in": true,
"recency": "RECENT",
"source": "web_search",
"strength": "STRONG",
"sub_question_id": "sq2"
},
{
"claim": "Some outlets reported the tag transmitted a location at 4:56 p.m. on July 16, 2026, though other reports describe mid-July transmissions as Z-pings only.",
"credibility": 45,
"direction": "NEUTRAL",
"priced_in": false,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "WEAK",
"sub_question_id": "sq2"
},
{
"claim": "Tracker shows Contender tagged 540 days with 8,234 miles logged (vs ~7,100 miles cited earlier in July), implying continued distance accrual between location fixes.",
"credibility": 60,
"direction": "UP",
"priced_in": false,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "MODERATE",
"sub_question_id": "sq2"
},
{
"claim": "Contender\u0027s 2026 ping record shows long silences: no detections between late April and July 10, 2026.",
"credibility": 78,
"direction": "DOWN",
"priced_in": true,
"recency": "RECENT",
"source": "web_search",
"strength": "MODERATE",
"sub_question_id": "sq2"
},
{
"claim": "OCEARCH and multiple outlets state Contender is making his annual northward summer migration toward Cape Cod and eastern Canada.",
"credibility": 75,
"direction": "UP",
"priced_in": true,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "MODERATE",
"sub_question_id": "sq3"
},
{
"claim": "No confirmed Cape Cod or located August 2026 ping for Contender appeared in search results as of late July 2026.",
"credibility": 50,
"direction": "NEUTRAL",
"priced_in": false,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "WEAK",
"sub_question_id": "sq3"
},
{
"claim": "Great white activity in the Northwest Atlantic summer range is documented, including a large white shark feeding on a humpback carcass off Rhode Island in July 2026.",
"credibility": 70,
"direction": "NEUTRAL",
"priced_in": true,
"recency": "RECENT",
"source": "article_search",
"strength": "WEAK",
"sub_question_id": "sq3"
},
{
"claim": "OCEARCH\u0027s Dr. Robert Hueter explains a good location fix requires 10-30 seconds of continuous surface time; brief surfacings yield only Z-pings.",
"credibility": 88,
"direction": "NEUTRAL",
"priced_in": true,
"recency": "RECENT",
"source": "web_search",
"strength": "MODERATE",
"sub_question_id": "sq1"
},
{
"claim": "Contender\u0027s SPOT tag has been deployed ~18 months (since January 17, 2025), within but approaching typical multi-year SPOT tag battery/attachment lifespan.",
"credibility": 70,
"direction": "NEUTRAL",
"priced_in": true,
"recency": "VERY_RECENT",
"source": "web_search",
"strength": "MODERATE",
"sub_question_id": "sq1"
},
{
"claim": "No article in the search corpus provided Contender\u0027s full historical ping log or inter-ping interval distribution since tagging.",
"credibility": 40,
"direction": "NEUTRAL",
"priced_in": false,
"recency": "VERY_RECENT",
"source": "article_search",
"strength": "WEAK",
"sub_question_id": "sq2"
}
],
"information_gaps": [
"Full Contender ping log with dates/types since Jan 2025 (base rate of located pings per 6-week window)",
"Whether the reported July 16, 2026 4:56 p.m. transmission was a true located ping or a Z-ping",
"OCEARCH fleet-wide base rate: fraction of active-tag white sharks producing \u22651 located ping in July-August",
"Any tracker updates after July 22, 2026"
],
"key_uncertainties": [
"Whether tag attachment/battery degrades further before September 1",
"Whether recent Z-ping-only pattern reflects tag weakening vs. brief surfacing behavior",
"Whether Contender enters shallow surface-active Cape Cod/Maritimes habitat in time",
"Conflicting reports on July 2026 ping classification"
],
"n_evidence": 12
},
"timings": {
"forecast": 32.99,
"plan": 17.41,
"research": 32.03,
"synthesis": 27.77
}
}