Firefly – Residency
10th sighting in Gulf of Maine
Firefly @22155
Jun 20 – Jul 19, 2026 · Gulf of Maine
Mid-July Light, Right On Time
That green-grey horizon and I know each other well.
37 m
Deepest dive
1:50
Longest dive
60
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 20, 2026 | 28 m | 15.9°C | 24 m |
| Jun 21, 2026 | 31 m | 15.5°C | 27 m |
| Jul 3, 2026 | 111 m | 19.8°C | 37 m |
| Jul 19, 2026 | 31 m | 19.3°C | 25 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
37 m
Deepest dive
1:50
Longest dive
60
Dives
14 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 (111 m) and the published dive-behaviour distribution. Modelled, not measured.
Deep Effort Score
DeepPlace
Where this happened · Jul 3, 2026
measured- Seafloor depth
- 111 m
- Sea-surface temperature
- 19.8°C
- Distance from shore
- 14.0 km
Across the residency · 4 sightings
measured- Seafloor depth
- 28 m – 111 m
- Sea-surface temperature
- 15.5°C – 19.8°C
- Distance from shore
- 11.0 km – 25.0 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.