10m
    Cornwall & Devon, United Kingdom
    Sinah Common

    HMS BOYNE

    Best months: Jul–Sep

    Protected Area

    Sinah Common

    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 BOYNE 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 10m
    StandoutExceptional marine biodiversity

    The HMS Boyne, she's a proper piece of history, resting just off the Cornish coast. We love a wreck with a story, and the Boyne’s tale of accidentally blowing up and burning down to the waterline before she sank makes for some seriously dramatic underwater archaeology. You’re not getting a grand, intact ship here, rather a scatter of timbers and cannons, but that’s precisely her charm. At a shallow 10 metres, she's perfect for a longer dive, letting you really take your time poking around the debris field. We’d suggest going at slack tide; the currents here can get a bit pushy. The wooden hull has mostly disintegrated, but the sheer scale of the ship is evident in the spread of her remains. Think scattered ribs, thick timbers, and those impressive cannons, often adorned with plumose anemones and dead man's fingers. You’ll spot crabs scuttling amongst the wreckage and schools of pollack darting between the shadows. It feels like diving through a maritime graveyard, and the cool temperate water just adds to the atmosphere. It’s a site that really makes you think about the era.

    Typical HMS BOYNE Dive Profile

    5m10mSafety Stop0m10m max~60 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

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

    Today06:2117:2311h 2m daylightGolden hour 16:38

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    Conditions

    Ocean conditions, forecast and tides for HMS BOYNE

    HMS BOYNE Ocean Conditions

    Monthly averages for HMS BOYNE, 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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