35m
    Cornwall & Devon, United Kingdom
    Wight-Barfleur Reef

    MERDIS

    Best months: Jul–Sep

    Protected Area

    Wight-Barfleur Reef

    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) - MERDIS 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 35m
    StandoutExceptional marine biodiversity

    We love the Merdis. This wreck, a casualty of a German U-boat in 1917, now rests upright on the seabed at 35m. Dropping down, the first thing that hits you is the sheer scale. It's a big ship, still largely intact, and you can swim through the holds, imagining the cargo she once carried. The light filters down, illuminating clouds of juvenile pollock that swirl through the superstructure. Look closer, and you’ll find conger eels peering from every dark recess, their heads like knobbly fists, and the occasional dogfish tucked into the sand nearby. Our favourite moment is always finning past the stern, where the prop shaft and rudder are still clearly visible, encrusted in dead man's fingers. It's a dive that rewards slow exploration, allowing you to really soak in the history and the way the ocean has reclaimed it. Visibility can be a bit of a lottery, as it often is off the Cornish coast, but when it’s good, the Merdis is simply fantastic. Definitely one for experienced divers comfortable with deeper wrecks and the occasional current.

    Typical MERDIS Dive Profile

    15m30mSafety Stop0m35m 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 (35m) - 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 16:40

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    Conditions

    Ocean conditions, forecast and tides for MERDIS

    MERDIS Ocean Conditions

    Monthly averages for MERDIS, 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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