Cornwall & Devon, United Kingdom

    HMS Grenade

    Best months: Jul–Sep

    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) - HMS Grenade 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 HMS Grenade is one of those wrecks that really sticks with you. Dropping onto her deck, you immediately get a sense of her scale, even though she’s broken in places. We love how the hull is often draped in kelp, swaying gently in the current, almost like a living camouflage. You’ll spend most of your dive picking through her structure, finning past twisted metal and exposed compartments that hint at her wartime service. Look closely, and you’ll spot plumose anemones clinging to every surface, along with squat lobsters peeking out from behind the plates. Our favourite part is often the stern, where you can sometimes glimpse conger eels lurking in the deeper, darker sections. This isn't a site for beginners; the currents can be strong, and the depth means you need to be comfortable with a bit of a push. But for experienced wreck divers, the Grenade offers a genuinely rewarding dive, full of atmosphere and history.

    Safety Notes

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

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    Conditions

    Ocean conditions, forecast and tides for HMS Grenade

    HMS Grenade Ocean Conditions

    Monthly averages for HMS Grenade, 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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