31m
    Northumberland & Northeast, United Kingdom
    Holyhead Mountain

    DIADEM

    Protected Area

    Holyhead Mountain

    Why dive here

    With 118+ marine species recorded in the area - including dolphins, dwarf minke whales, humpback whales, ocean sunfish (mola mola) and orcas - DIADEM offers some of Northumberland & Northeast's richest wreck diving.

    Marine lifeDolphins, Dwarf Minke Whales, Humpback Whales, Ocean Sunfish (Mola Mola) and Orcas · 118+ species recorded
    CharacterWreck dive · max 31m
    StandoutRich in charismatic marine life

    The Diadem is a proper North Sea wreck, not some sun-drenched Caribbean afterthought. She’s a compact fishing vessel, ten metres long, that went down in 1980 west of North Stack. We love her because she’s small enough to get a real feel for on a single dive, especially if you’re comfortable with the depth, which sits around 31 metres. Drop down and you'll find her mostly intact, listing slightly. Visibility here can be a bit of a lottery, sometimes a clear 10 metres, other days more like a pea-souper, but that just adds to the adventure. Even in murkier conditions, you can still make out the superstructure, the wheelhouse area, and what’s left of her fishing gear. Crabs, lobsters, and a surprising number of ling often call the Diadem home. Look closely in the nooks and crannies for nudibranchs, especially on the metalwork. It's a great site for divers who appreciate the character of a working boat, not just the abundance of life, though there's plenty of that too once your eyes adjust. We'd suggest aiming for slack water, always. Otherwise, the current can be a bit of a workout.

    Typical DIADEM Dive Profile

    15m30mSafety Stop0m31m max~20 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

    Deep dive (31m) - monitor air consumption closely. Advanced 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.

    Today06:3817:3410h 56m daylightGolden hour 16:47

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