4m
    Cornwall & Devon, United Kingdom
    St Helen's Duver & Priory Wood

    CAMBRIAN

    Best months: Jul–Sep

    Protected Area

    St Helen's Duver & Priory Wood

    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) - CAMBRIAN 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 4m
    StandoutExceptional marine biodiversity

    The Cambrian isn't about deep diving; it's about history you can touch, right in the shallows. Sunk during the Dunkirk evacuation in 1940, this former trawler turned naval auxiliary vessel now lies broken but still recognisable in just four metres of water. We love popping down here on a calm day, especially with a bit of sun – the light play through the kelp can be incredible. You’ll find the bow and stern mostly intact, with the midships section more collapsed. Look for the engine block, still pretty solid, and the boiler, which often has conger eels tucked inside. It’s our favourite kind of shallow wreck: easily accessible, full of character, and teeming with life that’s made it home. Shoals of bib dart through the broken plates, spider crabs scuttle across the rusty framework, and we’ve often spotted dogfish resting in the sand nearby. If you’re into underwater photography, the Cambrian offers fantastic wide-angle opportunities, especially when the visibility is good, which averages around 5-10 metres here. Aim for a slack tide an hour or so before high water for the best conditions and minimal current. It's a perfect site for newer divers looking for their first wreck experience or for snorkelers who want more than just reef.

    Typical CAMBRIAN Dive Profile

    5mSafety Stop0m4m 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

    CAMBRIAN Wreck History

    Year Sunk

    1940

    Vessel Type

    fishing vessel

    Cause

    mine

    Before her military career, HMS Cambrian began life in 1924 as the steam trawler Lord Derby, built by Cochrane & Sons in Selby. She served in the fishing fleets under several different names, including Ocean Knight and Stella Procyon. With the outbreak of the Second World War in 1939, she was requisitioned by the Admiralty for naval service, armed, and commissioned as HMS Cambrian, tasked with the vital role of a boom defence vessel.

    Her naval career was short-lived. On May 30, 1940, while on patrol, HMS Cambrian struck a German-laid mine. The explosion was catastrophic, and the vessel sank quickly, becoming an early casualty of the war at sea. Her loss highlighted the constant danger faced by even the smallest support vessels of the Royal Navy.

    Today, the wreck of HMS Cambrian rests in just 4 metres of water, making it a fantastic and highly accessible dive for all experience levels. The shallow depth ensures excellent light and long bottom times. While the mine explosion and subsequent years underwater have left the wreck well broken, divers can easily identify key features like her boiler, parts of the triple-expansion engine, and scattered hull plating. It's a perfect site for a relaxed second dive, underwater photography, or for new divers to experience their first wreck.

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    Conditions

    Ocean conditions, forecast and tides for CAMBRIAN

    CAMBRIAN Ocean Conditions

    Monthly averages for CAMBRIAN, 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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