HMS LOYALTY
Protected Area
Dolphin Head Highly Protected Marine Area
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) - HMS LOYALTY offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.
The HMS Loyalty, known to some as the former HMS Rattler, is a proper dive for those who appreciate a bit of history with their nitrogen. Resting at 49 metres off the coast of Cornwall, this Algerine-class minesweeper went down in 1944, struck by a homing torpedo from U-480. We love how intact she remains for a wreck of her age and depth. You can often make out the bow gun, some of the superstructure, and the propeller, which is always a treat to see still in place. Our favourite part is dropping down through the often green but surprisingly clear water, watching the dark shape resolve into the familiar lines of a wartime vessel. Inside, you’ll find plenty of open spaces to carefully explore, with curious pollack and conger eels often making an appearance from behind collapsed plating. This isn't a dive for beginners; the depth and potential for currents mean you need solid deep-diving experience. It's a proper British wreck dive – a bit dark, a bit silty, but utterly rewarding for the story it tells and the life it now holds. Dive her on a calm day, ideally around slack water, and you'll get the best out of her.
Typical HMS LOYALTY Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Maximum depth 49m exceeds recreational limits (40m). Technical diving certification and equipment required.
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.
Reviews for HMS LOYALTY
Conditions
Ocean conditions, forecast and tides for HMS LOYALTY
HMS LOYALTY Ocean Conditions
Monthly averages for HMS LOYALTY, 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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