Cornwall & Devon, United Kingdom
    Trevose Head and Constantine Bay

    HEMSLEY 1

    Best months: Jul–Sep

    Protected Area

    Trevose Head and Constantine Bay

    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) - HEMSLEY 1 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 Hemsley 1 isn't your typical pretty reef dive, but we love it for its sheer historical grit. This old tanker, built in 1916, truly feels like a slice of maritime history frozen in time. She ran aground back in '69 on her way to the breakers, so you're seeing the end of her working life, not some dramatic wartime sinking. What you get is a really broken-up wreck, scattered across the seabed, which means plenty of nooks and crannies to poke around in. The hull plates are draped in dead man's fingers and colourful jewel anemones, creating these incredible textured tapestries. Ling often lurk in the deeper sections, and you’ll spot wrasse darting between the twisted metal. We'd suggest going at slack water to avoid any strong currents, as the visibility can be a bit challenging at times, but on a good day, the light filtering through the wreckage is quite something. It’s a dive for those who appreciate the stories ships tell, and don't mind getting up close with some real industrial archaeology.

    Safety Notes

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

    Today06:3617:3911h 2m daylightGolden hour 16:54

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    Conditions

    Ocean conditions, forecast and tides for HEMSLEY 1

    HEMSLEY 1 Ocean Conditions

    Monthly averages for HEMSLEY 1, 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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