Herc – Residency
16th sighting in Chatham Strait
Herc @32104
Jul 5 – Aug 6, 2025 · Chatham Strait
Chatham Strait · Jul – Aug 2025
146 m
Deepest dive
4:15
Longest dive
72
Dives
- Sightings
- 5
- Days between first and last sighting
- 33
- Deepest dive on record
- 146 m · this residency
Dive stats modelled within real depth limits — not measured
Get actual dive data with Risa Deep →| Sighting | Seafloor | Sea temp | Deepest dive (modelled) |
|---|---|---|---|
| Jul 5, 2025 | 66 m | 11.5°C | 41 m |
| Jul 28, 2025 | 161 m | 13.2°C | 146 m |
| Aug 3, 2025 | 102 m | 14.0°C | 75 m |
| Aug 4, 2025 | 21 m | 13.4°C | 16 m |
| Aug 6, 2025 | 45 m | 13.2°C | 35 m |
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
146 m
Deepest dive
4:15
Longest dive
72
Dives
21 m
Avg dive depth
5
Sightings
33
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 (161 m) and the published dive-behaviour distribution. Modelled, not measured.
Deep Effort Score
DeepPlace
Where this happened · Jul 28, 2025
measured- Seafloor depth
- 161 m
- Sea-surface temperature
- 13.2°C
- Distance from shore
- 2.0 km
Across the residency · 5 sightings
measured- Seafloor depth
- 21 m – 161 m
- Sea-surface temperature
- 11.5°C – 14.0°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 5 catalogued encounters on Happywhale.