36m
    Cornwall & Devon, United Kingdom
    Whitsand and Looe Bay

    HMSM A7

    Best months: Jul–Sep

    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.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 176+ species recorded
    Water10-18°C · warmest July, August, September
    CharacterWreck dive · max 36m
    StandoutExceptional marine biodiversity

    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

    15m30mSafety Stop0m36m max~20 min estimated bottom time

    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.

    Today06:3317:3611h 3m daylightGolden hour 16:52

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    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)

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    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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