29m
    Cornwall & Devon, United Kingdom
    Offshore Overfalls

    HMS SAPPER

    Best months: Jul–Sep

    Protected Area

    Offshore Overfalls

    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 SAPPER 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 29m
    StandoutExceptional marine biodiversity

    The HMS Sapper, a former trawler turned WWI minesweeper, sits upright at 29 metres, making her a genuinely compelling dive off the Cornish coast. We love wrecks with a bit of history, and this one certainly delivers – sunk by a mine in 1917, she’s a tangible piece of naval past. Dropping down, you'll feel the colder water, but it's worth it for the visibility, which can push past 15 metres on a good day. The wreck itself is remarkably intact. Her bow points east, and you can still pick out the triple expansion engine, a real highlight for us. The single boiler is also quite prominent, providing a great reference point. Schools of pollack dart through the structure, and the occasional conger eel peeks out from beneath plating. Our favourite part? The way the light filters through the broken deck beams, illuminating patches of jewel anemones that have colonised the metalwork. This dive suits those comfortable with deeper wrecks and temperate water conditions. The strong tides here mean slack water is crucial for an enjoyable dive, so plan your descent carefully. It’s not about huge pelagics, but about the atmosphere and the details of a century-old war grave.

    Typical HMS SAPPER Dive Profile

    10m20m30mSafety Stop0m29m max~30 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

    Depth of 29m - Advanced Open Water 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.

    Today06:1917:2111h 2m daylightGolden hour 16:37

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    Conditions

    Ocean conditions, forecast and tides for HMS SAPPER

    HMS SAPPER Ocean Conditions

    Monthly averages for HMS SAPPER, 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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