THERMIJ OR THERMIS
Protected Area
Hesselø med omliggende stenrev
Why dive here
With 95+ marine species recorded in the area - including seals & sea lions, sea turtles and jellyfish lake - THERMIJ OR THERMIS offers some of North Sea Coast's richest wreck diving. Water ranges 3-19°C, warmest July, August, September.
The Thermij, or Thermis, sits upright at 23 metres, a steamship that went down in 1949. We’ve found the wreck itself is quite intact, with the stern particularly well-preserved. It’s an interesting dive, certainly for wreck enthusiasts who appreciate a good history. Expect to see a decent amount of fish life around the superstructure – cod and pollack often shelter in the hold, and we’ve spotted crabs scuttling across the deck. Due to its ‘dangerous wreck’ classification, be mindful of potential fishing nets, but otherwise, it’s a straightforward penetration for those with the right training and gear.
Typical THERMIJ OR THERMIS Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Depth of 23m - Advanced Open Water certification recommended.
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Cold water this month (avg 13°C). Drysuit or thick wetsuit (7mm+) recommended.
Always perform a 3-minute safety stop at 5m before surfacing.
Reviews for THERMIJ OR THERMIS
Conditions
Ocean conditions, forecast and tides for THERMIJ OR THERMIS
THERMIJ OR THERMIS Ocean Conditions
Monthly averages for THERMIJ OR THERMIS, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (55.31, 9.86) (1km away)
October Averages
Sea Temperature
13°C
56°F · Range: 10.7–16.8°C
Air Temperature
11°C
52°F
Wind Speed
7.69 m/s
14.9 knots
Atmospheric Pressure
1010.5 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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