32m
    Cornwall & Devon, United Kingdom
    Studland to Portland

    HM submarine A3

    Best months: Jul–Sep

    Protected Area

    Studland to Portland

    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) - HM submarine A3 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 32m
    StandoutExceptional marine biodiversity

    The HM submarine A3 is a real treat for anyone who loves a bit of history with their diving. This isn't some broken-up pile of metal; she sits upright and largely intact at 32 metres, a proper time capsule. Dropping down, you'll see her shape emerge from the gloom, long and slender, almost exactly as she looked when she sank in 1912 after a collision. We particularly love the feeling of swimming along her deck, imagining the crew on board. While the conning tower hatch is gone, and a few windows are open, the pressure hull is remarkably preserved. You can’t penetrate, of course, but just seeing the torpedo tubes still in place, peering into those open spaces, gives you a shiver. It’s dark down there, even on a sunny day, so good lights are essential to pick out the details and the marine life that has made her home. Expect to find plenty of crabs tucked into crevices, some respectable lobsters under the hull, and often a decent sized conger eel or two peeking out. It’s a site that really makes you think, a sombre reminder of naval history, and our pick for anyone who appreciates the quiet dignity of a well-preserved wreck.

    Typical HM submarine A3 Dive Profile

    15m30mSafety Stop0m32m 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 (32m) - 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.

    Today06:2517:2711h 2m daylightGolden hour 16:43

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    Conditions

    Ocean conditions, forecast and tides for HM submarine A3

    HM submarine A3 Ocean Conditions

    Monthly averages for HM submarine A3, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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