10m
    Bornholm, Denmark
    Saltholm og omliggende hav

    GRETHE

    Best months: Jul–Sep

    Protected Area

    Saltholm og omliggende hav

    Why dive here

    With 66+ marine species recorded in the area - including jellyfish lake - GRETHE offers some of Bornholm's richest wreck diving. Water ranges 3-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeJellyfish Lake · 66+ species recorded
    Water3-18°C · warmest July, August, September
    CharacterWreck dive · max 10m

    The Grethe is one of our favourite wreck dives on Bornholm, primarily because it's so accessible and still has that tangible sense of history. She’s a steamship, sunk in 1940, and sits upright in a shallow 10 metres of water. We love a wreck where you can really get a feel for the ship, and the Grethe delivers. You’ll see her bow first, often with a lazy cod or two peeking out from the darker recesses. The stern is largely intact, and you can swim through the holds – an easy penetration for even less experienced wreck divers. Sunlight filters through the top, illuminating the dense growth of green and brown algae that coats almost every surface. Flatfish often hug the sand around the wreck’s perimeter, almost perfectly camouflaged. We always find ourselves drawn to the intact mast, still standing proud, now a habitat for small crabs and anemones. It’s a dive that tells a story, and you can practically feel the Baltic’s cold embrace from decades past. It’s a great pick for newer wreck divers or those just looking for a relaxed exploration.

    Typical GRETHE Dive Profile

    5m10mSafety Stop0m10m max~60 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

    Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

    Cold water this month (avg 14°C). Drysuit or thick wetsuit (7mm+) recommended.

    Today06:3117:2210h 50m daylightGolden hour 16:31

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    Conditions

    Ocean conditions, forecast and tides for GRETHE

    GRETHE Ocean Conditions

    Monthly averages for GRETHE, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (54.94, 13.85) (7km away)

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    October Averages

    Sea Temperature

    14°C

    57°F · Range: 11.7–16.3°C

    Air Temperature

    12°C

    53°F

    Wind Speed

    8.16 m/s

    15.9 knots

    Atmospheric Pressure

    1013.3 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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