33m
    Cornwall & Devon, United Kingdom
    Studland Cliffs

    CASTLEREAGH

    Best months: Jul–Sep

    Protected Area

    Studland Cliffs

    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) - CASTLEREAGH 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 33m
    StandoutExceptional marine biodiversity

    The Castlereagh, or what's left of her anyway, is a proper chunk of history lying off the Cornish coast. We love a good steamship wreck, and this one, originally the Perth Fisher, has definitely settled into her seabed home since 1925. Dropping down to 33 metres, you're not going to find a fully intact vessel, but that's part of the charm. The deck plating has collapsed, revealing the bones of the ship – a single boiler stands proud, a real focal point. It’s perfect for divers who enjoy poking around structural remains, rather than swimming through corridors. What you'll find here is a robust wreck, well-colonised by local life. Expect to see plump conger eels peeking out from every dark nook, their thick bodies wrapped around twisted metal. Dead man’s fingers add splashes of orange and white, swaying gently with the surge, and the occasional dogfish might glide past, indifferent to your presence. The visibility here can be a bit of a lottery, sometimes a clear 10 metres, other days a moody 3, so pick your day carefully, ideally after a few days of settled weather. We'd suggest timing your dive for slack water; the currents can pick up, making it a bit of a tug-of-war if you get it wrong.

    Typical CASTLEREAGH Dive Profile

    15m30mSafety Stop0m33m max~20 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

    Deep dive (33m) - monitor air consumption closely. Advanced certification recommended.

    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.

    Today06:2417:2611h 2m daylightGolden hour 16:42

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    Conditions

    Ocean conditions, forecast and tides for CASTLEREAGH

    CASTLEREAGH Ocean Conditions

    Monthly averages for CASTLEREAGH, 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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