41m
    Cornwall & Devon, United Kingdom
    Tennyson

    HMS ACHERON (STERN SECTION)

    Best months: Jul–Sep

    Protected Area

    Tennyson

    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 ACHERON (STERN SECTION) 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 41m
    StandoutExceptional marine biodiversity

    We’ve spent a lot of hours on Cornish wrecks, and the stern section of the HMS Acheron always pulls us back. It’s a deep dive, sitting at 41 metres, so definitely one for the experienced trimix crowd. Dropping down, the first thing you notice is the sheer size of the thing, especially the twin shafts and props, they’re colossal. You get a real sense of the power this destroyer once had. The wreck itself is pretty broken, but the stern is largely intact and it’s become a fantastic artificial reef. We love swimming through the torpedo tubes, which are now completely encrusted with jewel anemones, glowing orange and pink in your torch beam. Look for conger eels tucked into every dark crevice, some of them are huge. On a clear day, with a bit of ambient light, it feels almost otherworldly down there, a proper piece of history reclaimed by the ocean. It’s not a quick bounce dive; we suggest taking your time, really exploring the different compartments and soaking in the atmosphere. The currents can be tricky here, so pick your slack water carefully.

    Typical HMS ACHERON (STERN SECTION) Dive Profile

    15m30m45mSafety Stop0m41m 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 41m 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.

    Today06:2217:2511h 2m daylightGolden hour 16:40

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    Conditions

    Ocean conditions, forecast and tides for HMS ACHERON (STERN SECTION)

    HMS ACHERON (STERN SECTION) Ocean Conditions

    Monthly averages for HMS ACHERON (STERN SECTION), 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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