51m
    Cornwall & Devon, United Kingdom
    Dolphin Head Highly Protected Marine Area

    WHALE UNIT 552

    Best months: Jul–Sep

    Protected Area

    Dolphin Head Highly Protected Marine Area

    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) - WHALE UNIT 552 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 51m
    StandoutExceptional marine biodiversity

    Diving a factory ship at 51 metres always feels a bit like stepping into a cold, wet time capsule, and Whale Unit 552 off Cornwall is no exception. We love this wreck for its sheer scale, a proper deep dive that rewards careful planning and good bottom time management. You’re dropping onto a massive industrial hulk, still largely intact, with enormous holds and machinery that tell a story of its working life before it found its final resting place. The visibility here can be decent on a good day, but it’s always dark at depth, so good lights are essential to really pick out the detail. We’ve found big conger eels tucked into the darker recesses, and the wreck structure itself is covered in dead man's fingers and anemones, which add a surprising splash of colour to the gloom. Our favourite part has to be exploring the open deck areas, imagining the whale processing that once took place here. This is a wreck for experienced divers comfortable with deeper profiles and the often chilly, current-swept conditions of the English Channel. Definitely one to factor in for a multi-day trip when the weather window looks promising.

    Typical WHALE UNIT 552 Dive Profile

    15m30m45mSafety Stop0m51m 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 51m 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.

    Today06:1917:2211h 3m daylightGolden hour 16:38

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    Conditions

    Ocean conditions, forecast and tides for WHALE UNIT 552

    WHALE UNIT 552 Ocean Conditions

    Monthly averages for WHALE UNIT 552, 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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