Mathsy – Residency
20th sighting in Iceland
Mathsy @16938
Jun 24 – Jul 23, 2026 · Iceland
Westfjords, Midsummer Bounty
Cliffs in sight, herring thick, another summer stacking up nicely under these fins.
93 m
Deepest dive
3:19
Longest dive
35
Dives
- Sightings
- 4
- Days between first and last sighting
- 29
Dive stats modelled within real depth limits — not measured
Get actual dive data with Risa Deep →| Sighting | Seafloor | Sea temp | Deepest dive (modelled) |
|---|---|---|---|
| Jun 24, 2026 | 72 m | 8.5°C | 56 m |
| Jun 30, 2026 | 128 m | 7.8°C | 93 m |
| Jul 5, 2026 | 108 m | 8.4°C | 53 m |
| Jul 23, 2026 | 107 m | 8.8°C | 52 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
93 m
Deepest dive
3:19
Longest dive
35
Dives
24 m
Avg dive depth
4
Sightings
29
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 (128 m) and the published dive-behaviour distribution. Modelled, not measured.
Deep Effort Score
DeepPlace
Where this happened · Jun 30, 2026
measured- Seafloor depth
- 128 m
- Sea-surface temperature
- 7.8°C
- Distance from shore
- 4.0 km
Across the residency · 4 sightings
measured- Seafloor depth
- 72 m – 128 m
- Sea-surface temperature
- 7.8°C – 8.8°C
- Distance from shore
- 1.0 km – 5.0 km
Sources: GEBCO seafloor grid · NASA JPL MUR sea temperature · PacIOOS coastline distance
Source records
This activity is assembled from 4 catalogued encounters on Happywhale.