Herc – Residency
21st sighting in Chatham Strait
Herc @32104
May 18 – Sep 23, 2026 · Chatham Strait
Chatham Strait, All Summer
Cold green water, herring thick, and the whole strait knows my shoulder.
67 m
Deepest dive
2:09
Longest dive
50
Dives
- Sightings
- 7
- Days between first and last sighting
- 127
Dive stats modelled within real depth limits — not measured
Get actual dive data with Risa Deep →| Sighting | Seafloor | Sea temp | Deepest dive (modelled) |
|---|---|---|---|
| May 18, 2026 | 293 m | 8.6°C | 31 m |
| Jun 12, 2026 | 90 m | 10.0°C | 67 m |
| Jul 17, 2026 | 85 m | 13.0°C | 16 m |
| Jul 27, 2026 | 159 m | 13.0°C | 43 m |
| Jul 31, 2026 | 80 m | 12.8°C | 66 m |
| Aug 31, 2026 | 64 m | — | 32 m |
| Sep 23, 2026 | -34 m | 10.6°C | — |
Seafloor and sea temperature measured · ✳ dives modelled
Deepest dive against the seafloor, per sighting
Seafloor · measured Deepest dive · modelledDepth runs down from the surface. The modelled dive never passes the measured seafloor at that sighting.
Dives
67 m
Deepest dive
2:09
Longest dive
50
Dives
19 m
Avg dive depth
7
Sightings
127
Days first → last
Dive metrics are modelled within real depth limits — not measured
Get actual dive data with Risa Deep →Dive profile
modelledDepth shaped by the seafloor limit here (90 m) and the published dive-behaviour distribution. Modelled, not measured.
Deep Effort Score
DeepPlace
Where this happened · Jun 12, 2026
measured- Seafloor depth
- 90 m
- Sea-surface temperature
- 10.0°C
- Distance from shore
- 1.0 km
Across the residency · 7 sightings
measured- Seafloor depth
- -34 m – 293 m
- Sea-surface temperature
- 8.6°C – 13.0°C
- Distance from shore
- 1.0 km – 2.0 km
Sources: GEBCO seafloor grid · NASA JPL MUR sea temperature · PacIOOS coastline distance
Source records
This activity is assembled from 7 catalogued encounters on Happywhale.