56m
    Cornwall & Devon, United Kingdom
    Rame Head

    HMSM H 52

    Best months: Jul–Sep

    Protected Area

    Rame Head

    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 H 52 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 56m
    StandoutExceptional marine biodiversity

    The H 52 isn’t just another bit of metal on the seabed. This wreck, a B-class submarine, went down in 1928, torpedoed for a film called ‘Q Ships’. We love that story, it gives the dive a quirky historical twist. Lying at 56 metres, the boat’s still largely intact, a real hulk emerging from the gloom. You can make out the conning tower, the torpedo tubes, even the periscope shears. It’s an advanced dive, for sure, with the depth and often stiff currents, but the rewards are there. On a good day, with visibility stretching to 10 metres, the sheer scale of the H 52 is impressive. Shoals of bib dart in and out of the broken plating, while plump conger eels peer from every dark crevice. Our favourite detail is the way the soft corals have started to colonise the decks, a vibrant splash of orange and pink against the grey steel. It’s a dive for wreck enthusiasts who appreciate history and aren’t afraid of a bit of depth and cold water. Look for slack water if you want to explore the exterior properly; otherwise, it’s a fast drift over a fascinating piece of cinema history.

    Typical HMSM H 52 Dive Profile

    15m30m45m60mSafety Stop0m56m max~15 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

    Maximum depth 56m 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.

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

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    Conditions

    Ocean conditions, forecast and tides for HMSM H 52

    HMSM H 52 Ocean Conditions

    Monthly averages for HMSM H 52, 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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