Risa
Try Deep freeDeep
Risa
Try Deep freeDeep
Activity map — real sighting points on an OpenStreetMap basemap © OpenStreetMap contributors
Monterey Bay

Checkmarks – Residency

246th sighting in Monterey Bay
Fluke of Checkmarks
Checkmarks Confirmed in the catalog @700
Jun 24 – Oct 5, 2026 · Monterey Bay

Monterey, All Summer Long

Krill's running deep and I'm the bay's biggest regular.

211 m
Deepest dive
6:59
Longest dive
306
Dives
Sightings
27
Days between first and last sighting
103

Dive stats modelled within real depth limits — not measured

Get actual dive data with Risa Deep →
SightingSeafloorSea tempDeepest dive (modelled)
Jun 24, 202689 m16.5°C79 m
Jul 11, 202686 m16.0°C26 m
Jul 14, 2026202 m16.7°C22 m
Jul 20, 202675 m16.1°C67 m
Jul 22, 2026472 m17.1°C30 m
Jul 23, 202642 m17.0°C32 m
Jul 25, 202666 m17.0°C51 m
Jul 26, 202639 m16.9°C35 m
Jul 28, 2026143 m16.9°C17 m
Aug 3, 2026168 m17.5°C102 m
Aug 4, 2026297 m17.3°C211 m
Aug 4, 2026229 m17.3°C135 m
Aug 5, 2026243 m17.2°C123 m
Aug 6, 2026153 m17.2°C37 m
Aug 7, 2026254 m17.6°C29 m
Aug 26, 2026208 m16.8°C62 m
Aug 31, 2026254 m15.4°C84 m
Sep 2, 202674 m15.3°C28 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 24, 2026 — seafloor 89 m (measured), deepest dive 79 m (modelled)Jun 24Jul 11, 2026 — seafloor 86 m (measured), deepest dive 26 m (modelled)Jul 14, 2026 — seafloor 202 m (measured), deepest dive 22 m (modelled)Jul 20, 2026 — seafloor 75 m (measured), deepest dive 67 m (modelled)Jul 22, 2026 — seafloor 472 m (measured), deepest dive 30 m (modelled)Jul 23, 2026 — seafloor 42 m (measured), deepest dive 32 m (modelled)Jul 23Jul 25, 2026 — seafloor 66 m (measured), deepest dive 51 m (modelled)Jul 26, 2026 — seafloor 39 m (measured), deepest dive 35 m (modelled)Jul 28, 2026 — seafloor 143 m (measured), deepest dive 17 m (modelled)Aug 3, 2026 — seafloor 168 m (measured), deepest dive 102 m (modelled)Aug 4, 2026 — seafloor 297 m (measured), deepest dive 211 m (modelled)Aug 4Aug 4, 2026 — seafloor 229 m (measured), deepest dive 135 m (modelled)Aug 5, 2026 — seafloor 243 m (measured), deepest dive 123 m (modelled)Aug 6, 2026 — seafloor 153 m (measured), deepest dive 37 m (modelled)Aug 7, 2026 — seafloor 254 m (measured), deepest dive 29 m (modelled)Aug 26, 2026 — seafloor 208 m (measured), deepest dive 62 m (modelled)Aug 26Aug 31, 2026 — seafloor 254 m (measured), deepest dive 84 m (modelled)Sep 2, 2026 — seafloor 74 m (measured), deepest dive 28 m (modelled)Sep 12, 2026 — seafloor 567 m (measured), deepest dive 34 m (modelled)Sep 18, 2026 — seafloor 175 m (measured), deepest dive 80 m (modelled)Sep 24, 2026 — seafloor 182 m (measured), deepest dive 121 m (modelled)Sep 24Sep 25, 2026 — seafloor 56 m (measured), deepest dive 43 m (modelled)Sep 25, 2026 — seafloor 161 m (measured), deepest dive 46 m (modelled)Sep 30, 2026 — seafloor 148 m (measured), deepest dive 86 m (modelled)Oct 2, 2026 — seafloor 254 m (measured), deepest dive 33 m (modelled)Oct 5, 2026 — seafloor 283 m (measured), deepest dive 62 m (modelled)Oct 5Oct 5, 2026 — seafloor 375 m (measured), deepest dive 38 m (modelled)

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

Dives

211 m
Deepest dive
6:59
Longest dive
306
Dives
25 m
Avg dive depth
27
Sightings
103
Days first → last

Dive metrics are modelled within real depth limits — not measured

Get actual dive data with Risa Deep →

Dive profile

modelled
0125250211 mstartdive sequence (illustrative)

Depth shaped by the seafloor limit here (297 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.

Unlock with Risa Deep

Place

Where this happened · Aug 4, 2026

measured
Seafloor depth
297 m
Sea-surface temperature
17.3°C
Distance from shore
5.0 km

Across the residency · 27 sightings

measured
Seafloor depth
39 m – 567 m
Sea-surface temperature
15.3°C – 17.9°C
Distance from shore
2.0 km – 16.0 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 27 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).

Happywhale runs on donations: support Happywhale →

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