28m
    Scottish East Coast & Borders, United Kingdom
    St Mary's Island

    HMS MOLLUSC (EX MEDUSA)

    Protected Area

    St Mary's Island

    Why dive here

    With 112+ marine species recorded in the area - including dolphins, dwarf minke whales, humpback whales, ocean sunfish (mola mola) and orcas - HMS MOLLUSC (EX MEDUSA) offers some of Scottish East Coast & Borders's richest wreck diving.

    Marine lifeDolphins, Dwarf Minke Whales, Humpback Whales, Ocean Sunfish (Mola Mola) and Orcas · 112+ species recorded
    CharacterWreck dive · max 28m
    StandoutRich in charismatic marine life

    The HMS Mollusc, formerly HMS Medusa, holds a gritty tale from 1941. She was a yacht-turned-auxiliary patrol vessel, sunk by near misses from German bombs, and now she lies upright at 28 metres. We love that you can still make out her elegant lines despite the years of submersion. Dropping down, the first thing you notice is the way the light filters through the green water, often quite atmospheric. Her stern is broken, a testament to the explosions, but the bow remains impressively intact. We always find ourselves drawn to the forward deck, where the old railings are now heavily encrusted with dead man's fingers and colourful jewel anemones. These wrecks off the Scottish East Coast are fantastic for finding conger eels, and the Mollusc is no exception; peer into any dark crevice. Our favourite time to dive her is on a slack tide, obviously, but also when the sun is higher in the sky. You get better ambient light, which really makes the encrusting life pop. This wreck is a proper piece of history, colonised by life, perfect for divers who appreciate a bit of character and a good story.

    Typical HMS MOLLUSC (EX MEDUSA) Dive Profile

    10m20m30mSafety Stop0m28m 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 28m - 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.

    Today06:2817:1910h 51m daylightGolden hour 16:29

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