39m
    Cornwall & Devon, United Kingdom
    South Dorset

    DERNA (PROBABLY)

    Best months: Jul–Sep

    Protected Area

    South Dorset

    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) - DERNA (PROBABLY) 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 39m
    StandoutExceptional marine biodiversity

    Diving the *Derna* is a proper plunge into history. This old steamship, resting upright at 39 meters, is a substantial wreck, and we reckon it’s one of the best deeper historical dives in the area. Dropping down, you’ll find the bow section still quite intact, often shrouded in a shoal of pout whiting. We love finning past the main hold, which is now a haven for crabs and lobsters tucked into every crevice. Our favourite part is navigating towards the twin boilers, massive cylinders encrusted with dead man's fingers, where conger eels have set up shop. The stern is more broken, but gives a great sense of the sheer power of the triple-expansion engine. Visibility can be hit or miss, but on a good day, with a bit of ambient light, the scale of the *Derna* is truly impressive. This is a dive for those comfortable at depth, who appreciate the silent stories a ship tells after a century on the seabed.

    Typical DERNA (PROBABLY) Dive Profile

    15m30m45mSafety Stop0m39m 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 (39m) - 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.

    Today06:2417:2711h 3m daylightGolden hour 16:42

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    Conditions

    Ocean conditions, forecast and tides for DERNA (PROBABLY)

    DERNA (PROBABLY) Ocean Conditions

    Monthly averages for DERNA (PROBABLY), 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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