HMSM A7
Protected Area
Whitsand and Looe Bay
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) - HMSM A7 offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.
The HMSM A7 is a bit of a sombre dive, but utterly fascinating. We're talking about a wreck that's been down since 1914, a British submarine that just never came back up during an exercise off Rame Head. At 36 metres, it’s a serious dive, definitely one for experienced cold-water wreck enthusiasts who appreciate a piece of history. What hits you first, even through the murk sometimes, is the sheer scale of the thing for its time – 30 metres long, quite slender, sitting upright on the seabed. You can often make out the conning tower, the torpedo tubes, and the general shape of a submarine, even after all these years. It's not a wreck you penetrate, given its age and classification, but you can certainly swim around and over it, getting a real sense of its past. The marine life here is classic Cornwall. You'll often find conger eels peering out from gaps, their heads like gnarled tree roots. Ballan wrasse dart amongst the plates, and the wreck itself is encrusted with dead man's fingers and anemones, painting a surprisingly colourful picture on such a dark relic. We’ve found the best visibility usually comes with neap tides and a touch of calm weather, making the journey out and the dive itself much more rewarding. It’s a sobering dive, yes, but one that always leaves you thinking.
Typical HMSM A7 Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Deep dive (36m) - monitor air consumption closely. Advanced 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 HMSM A7
Dive shops near HMSM A7
Dive Looe
Plymouth Diving Centre
Sound Diving Limited
Scuba 2000
Viewpoint Diving Centre
Karleyth Diving Ltd.
Reviews for HMSM A7
Conditions
Ocean conditions, forecast and tides for HMSM A7
HMSM A7 Ocean Conditions
Monthly averages for HMSM A7, 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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