59m
    Cornwall & Devon, United Kingdom
    Carricknath Point to Porthbean Beach

    HMT COMET

    Best months: Jul–Sep

    Protected Area

    Carricknath Point to Porthbean Beach

    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) - HMT COMET 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 59m
    StandoutExceptional marine biodiversity

    The HMT Comet, a trawler sunk by a mine in 1940, isn't for the faint of heart. Sitting at a chilly 59 metres off Falmouth, it's a serious technical dive, demanding respect and proper planning. We love its intact nature, a stark contrast to some of the more broken-up wrecks in the Channel. Dropping down, the bow is often the first thing to loom into view, typically shrouded in the green gloom that’s so characteristic of British waters, even on a clear day. Visibility here can be a lottery, but when it’s good, you can appreciate the scale of this old girl. Her large trawl winches are still discernible, encrusted with a thick layer of plumose anemones that sway gently in the slight current. We’ve spotted conger eels the size of small tree trunks peering out from beneath collapsed plating. Our favourite part is probably the stern, where the prop is often still visible, surrounded by schooling bib and pollack that shimmer under torchlight. It’s a somber, silent place, a real journey back in time, and an absolute privilege for experienced wreck divers. Just remember your drysuit and plenty of gas; it’s a long way home.

    Typical HMT COMET Dive Profile

    15m30m45m60mSafety Stop0m59m max~15 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

    Maximum depth 59m exceeds recreational limits (40m). Technical diving certification and equipment required.

    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.

    Today06:3617:3911h 3m daylightGolden hour 16:55

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    Conditions

    Ocean conditions, forecast and tides for HMT COMET

    HMT COMET Ocean Conditions

    Monthly averages for HMT COMET, 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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