37m
    Cornwall & Devon, United Kingdom
    Tennyson

    HMSM UPSTART

    Best months: Jul–Sep

    Protected Area

    Tennyson

    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 UPSTART 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 37m
    StandoutExceptional marine biodiversity

    The HMSM Upstart is one of those wrecks we keep coming back to. Sitting upright at 37 metres, she’s an easy dive on a calm day, though that depth means some current can really make it a workout. Built in 1942, this U-class submarine was scuttled in 1957, so she’s been down there a while and the sea has really claimed her. We love finning along her deck, spotting the periscope tubes and the outline of her conning tower. The bow torpedo tubes are a particular favourite – you can usually see conger eels peering out, their thick bodies disappearing back into the dark. Look closely for dogfish eggs tucked into crevices and always keep an eye out for curious seals. If you hit it right, with good visibility and slack water, it’s a genuinely atmospheric dive, a real window into naval history and the power of the ocean to reclaim what’s hers. This isn't a site for beginners; that depth and the potential for current mean you want to be comfortable with your diving.

    Typical HMSM UPSTART Dive Profile

    15m30mSafety Stop0m37m 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 (37m) - 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.

    Today06:2217:2511h 3m daylightGolden hour 16:41

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    Conditions

    Ocean conditions, forecast and tides for HMSM UPSTART

    HMSM UPSTART Ocean Conditions

    Monthly averages for HMSM UPSTART, 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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