Cornwall & Devon, United Kingdom
    Hackett's Marsh

    GRACE DIEU

    Best months: Jul–Sep

    Protected Area

    Hackett's Marsh

    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) - GRACE DIEU 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
    StandoutExceptional marine biodiversity

    The *Grace Dieu* is something else, not your typical wreck dive. We're talking about a medieval ship, sunk in 1439 after a lightning strike. What’s left isn't a towering superstructure, but a scattering of ballast stones, timbers, and, with a bit of digging (and the right permits), artefacts that surface from the mud. It's an archaeological dive more than a penetration one. Visibility here can be a bit of a lottery, as it often is in the Solent, but on a good day, the low light filtering through the green water makes the site incredibly atmospheric. We’ve spent hours here, meticulously fanning away sediment to reveal sections of hull, feeling the ancient wood under our fingertips. It’s a slow dive, for divers who appreciate history and aren't chasing pelagics. You won't find schools of barracuda, but we've seen plenty of crabs scuttling over the stones, conger eels peeking from beneath buried timbers, and occasional flatfish settled on the silty bottom. Our advice? Go with a knowledgeable guide who can point out the subtle signs of history, and be prepared for a dive that engages your mind as much as your buoyancy control. This site is for those who love uncovering secrets, for the underwater historians among us.

    Safety Notes

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

    Today06:2217:2311h 2m daylightGolden hour 16:39

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    Conditions

    Ocean conditions, forecast and tides for GRACE DIEU

    GRACE DIEU Ocean Conditions

    Monthly averages for GRACE DIEU, 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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