8m
    Cornwall & Devon, United Kingdom
    Sully Island

    MARGARETHA (POSSIBLY)

    Best months: Jul–Sep

    Protected Area

    Sully Island

    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) - MARGARETHA (POSSIBLY) 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 8m
    StandoutExceptional marine biodiversity

    The Margaretha, off the coast of Cornwall, is one of those wrecks that really tells a story, even if much of it is conjecture. We love a historical mystery, and this motor vessel, sunk by a mine in 1940, certainly delivers. At a shallow 8 metres, it’s not about deep exploration, but rather a chance to really soak in a piece of wartime history. What you'll find is a very broken up wreck, scattered across the seabed. Think more debris field than intact vessel, but don’t let that put you off. The structure that remains is a fantastic home for marine life. We’ve seen conger eels poking out from under plates of twisted metal, and the skeletal remains of the hull offer shelter to spider crabs. Visibility can vary, but on a good day, with the sun filtering through, the metal takes on a greenish glow. It’s a good spot for newer wreck divers or those who prefer a longer bottom time without the narcosis. Look for the anchor chain running off into the sand – a poignant reminder of her last journey from Newport to Plymouth. Just remember, it can get silty, so take your time and watch your fins.

    Typical MARGARETHA (POSSIBLY) Dive Profile

    5m10mSafety Stop0m8m max~60 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

    Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

    Today06:3017:3111h 1m daylightGolden hour 16:45

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    Conditions

    Ocean conditions, forecast and tides for MARGARETHA (POSSIBLY)

    MARGARETHA (POSSIBLY) Ocean Conditions

    Monthly averages for MARGARETHA (POSSIBLY), 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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