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Activity map — real sighting points on an OpenStreetMap basemap © OpenStreetMap contributors
Monterey Bay

Checkmarks – Residency

219th sighting in Monterey Bay
Fluke of Checkmarks
Checkmarks Confirmed in the catalog @700
Jun 26 – Dec 28, 2025 · Monterey Bay

Summer's End in Monterey

Six months in my favorite bay, watching the seasons turn while the krill stayed thick.

186 m
Deepest dive
7:46
Longest dive
329
Dives
Sightings
30
Days between first and last sighting
185

Dive stats modelled within real depth limits — not measured

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SightingSeafloorSea tempDeepest dive (modelled)
Jun 26, 202549 m12.9°C40 m
Jun 27, 2025489 m12.8°C74 m
Jun 30, 202559 m13.1°C45 m
Jul 1, 20251,333 m13.5°C92 m
Jul 20, 202576 m15.8°C34 m
Jul 21, 202578 m15.8°C64 m
Jul 22, 2025425 m16.0°C52 m
Jul 23, 202593 m15.9°C24 m
Jul 26, 2025567 m16.2°C68 m
Jul 28, 2025102 m16.7°C91 m
Aug 4, 2025177 m14.9°C65 m
Aug 6, 2025114 m14.9°C82 m
Aug 9, 2025567 m15.1°C124 m
Aug 16, 202561 m15.5°C46 m
Oct 15, 2025478 m15.3°C84 m
Oct 15, 202571 m15.6°C33 m
Oct 25, 202587 m16.1°C58 m
Oct 29, 202568 m15.4°C53 m

Seafloor and sea temperature measured · ✳ dives modelled ·

Activity map — real sighting points on an OpenStreetMap basemap © OpenStreetMap contributors

Deepest dive against the seafloor, per sighting

Seafloor · measured Deepest dive · modelled
Jun 26, 2025 — seafloor 49 m (measured), deepest dive 40 m (modelled)Jun 26Jun 27, 2025 — seafloor 489 m (measured), deepest dive 74 m (modelled)Jun 30, 2025 — seafloor 59 m (measured), deepest dive 45 m (modelled)Jul 1, 2025 — seafloor 1,333 m (measured), deepest dive 92 m (modelled)Jul 20, 2025 — seafloor 76 m (measured), deepest dive 34 m (modelled)Jul 21, 2025 — seafloor 78 m (measured), deepest dive 64 m (modelled)Jul 21Jul 22, 2025 — seafloor 425 m (measured), deepest dive 52 m (modelled)Jul 23, 2025 — seafloor 93 m (measured), deepest dive 24 m (modelled)Jul 26, 2025 — seafloor 567 m (measured), deepest dive 68 m (modelled)Jul 28, 2025 — seafloor 102 m (measured), deepest dive 91 m (modelled)Aug 4, 2025 — seafloor 177 m (measured), deepest dive 65 m (modelled)Aug 4Aug 6, 2025 — seafloor 114 m (measured), deepest dive 82 m (modelled)Aug 9, 2025 — seafloor 567 m (measured), deepest dive 124 m (modelled)Aug 16, 2025 — seafloor 61 m (measured), deepest dive 46 m (modelled)Oct 15, 2025 — seafloor 478 m (measured), deepest dive 84 m (modelled)Oct 15, 2025 — seafloor 71 m (measured), deepest dive 33 m (modelled)Oct 15Oct 25, 2025 — seafloor 87 m (measured), deepest dive 58 m (modelled)Oct 29, 2025 — seafloor 68 m (measured), deepest dive 53 m (modelled)Oct 30, 2025 — seafloor 213 m (measured), deepest dive 150 m (modelled)Nov 2, 2025 — seafloor 1,014 m (measured), deepest dive 37 m (modelled)Nov 23, 2025 — seafloor 280 m (measured), deepest dive 109 m (modelled)Nov 23Nov 25, 2025 — seafloor 82 m (measured), deepest dive 45 m (modelled)Nov 26, 2025 — seafloor 152 m (measured), deepest dive 80 m (modelled)Nov 27, 2025 — seafloor 162 m (measured), deepest dive 91 m (modelled)Nov 28, 2025 — seafloor 237 m (measured), deepest dive 59 m (modelled)Dec 6, 2025 — seafloor 95 m (measured), deepest dive 59 m (modelled)Dec 6Dec 12, 2025 — seafloor 567 m (measured), deepest dive 186 m (modelled)Dec 13, 2025 — seafloor 303 m (measured), deepest dive 113 m (modelled)Dec 19, 2025 — seafloor 82 m (measured), deepest dive 14 m (modelled)Dec 28, 2025 — seafloor 235 m (measured), deepest dive 145 m (modelled)

Depth runs down from the surface. The modelled dive never passes the measured seafloor at that sighting.

Dives

186 m
Deepest dive
7:46
Longest dive
329
Dives
27 m
Avg dive depth
30
Sightings
185
Days first → last

Dive metrics are modelled within real depth limits — not measured

Get actual dive data with Risa Deep →

Dive profile

modelled
0100200186 mstartdive sequence (illustrative)

Depth shaped by the seafloor limit here (567 m) and the published dive-behaviour distribution. Modelled, not measured.

Deep Effort Score

Deep

Depth, duration and recovery resolved into a single number for this session.

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Place

Where this happened · Dec 12, 2025

measured
Seafloor depth
567 m
Sea-surface temperature
14.2°C
Distance from shore
16.0 km

Across the residency · 30 sightings

measured
Seafloor depth
49 m – 1,333 m
Sea-surface temperature
12.8°C – 16.7°C
Distance from shore
2.0 km – 18.0 km

Sources: GEBCO seafloor grid · NASA JPL MUR sea temperature · PacIOOS coastline distance

Activity map — real sighting points on an OpenStreetMap basemap © OpenStreetMap contributors

Source records

This activity is assembled from 30 catalogued encounters on Happywhale.

Sighting records from Happywhale, published as occurrence data via GBIF. Individual records are licensed CC0 1.0, CC BY 4.0 or CC BY-NC 4.0, depending on the contributor.

The photographs and fluke identifications behind every sighting are the work of the contributing observers — the citizen scientists, naturalists and operators who logged them, each named in the underlying GBIF occurrence record. Every activity links out to its source encounters on Happywhale. Basemaps © OpenStreetMap contributors (ODbL).

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Breach is an independent project. It is not affiliated with, nor endorsed by, Happywhale or GBIF.