THELMA
Protected Area
Offshore Overfalls
Why dive here
With 176+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - THELMA offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.
The THELMA wreck, lying at 25 metres, offers a decent dive for those exploring Cornwall's coastal waters. This steamship, sunk by a mine in 1917, is now home to an array of curious residents. We’ve found conger eels tucked into shadowy nooks and often spotted pollack darting through the structure. Visibility can vary here, as it often does in the UK, but on a good day, the wreck’s bones are clear enough to explore its general outline. It’s a solid pick for divers keen on maritime history and the hardy creatures that thrive on these artificial reefs.
Typical THELMA 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 25m - Advanced Open Water certification recommended.
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to THELMA
Dive shops near THELMA
Sussex Diving & Leisure
Mulberry Marine Experiences CIC
Abyss Scuba School
In2 Diving
Ocean View
Reviews for THELMA
Conditions
Ocean conditions, forecast and tides for THELMA
THELMA Ocean Conditions
Monthly averages for THELMA, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)
October Averages
Sea Temperature
17°C
62°F · Range: 15.1–17.5°C
Air Temperature
13°C
56°F
Wind Speed
8.14 m/s
15.8 knots
Atmospheric Pressure
1011 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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