Cornwall & Devon, United Kingdom
    Hackett's Marsh

    Wreck of 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) - Wreck of 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* isn't your typical metal hulk, and that's precisely why we love it. This isn't a dive where you're penetrating cabins; it's an archaeological journey back to 1418, an English warship lost to fire in 1439. What you find here are the preserved timbers, a remarkable testament to early shipbuilding. We’re talking about huge, dark wooden ribs emerging from the seabed, often draped in kelp, giving the whole site an almost organic feel. Visibility can be a Cornish lottery, but on a good day, the scale of these timbers is impressive, creating shadowy canyons where conger eels lurk, and schools of pilchard dart past. Look closely among the wreckage; you’ll spot native oysters, beadlet anemones, and plenty of dogfish snuffling around for an easy meal. This dive suits those who appreciate history as much as marine life, divers who enjoy a more contemplative experience rather than high-speed drifts. We'd suggest timing your dive for slack water to really take your time exploring the details. It's a genuinely unique site.

    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 Wreck of Grace Dieu

    Wreck of Grace Dieu Ocean Conditions

    Monthly averages for Wreck of 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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