15m
    North Sea Coast, Denmark
    Røsnæs, Røsnæs Rev og Kalundborg Fjord

    POSEIDON

    Best months: Jul–Aug

    Protected Area

    Røsnæs, Røsnæs Rev og Kalundborg Fjord

    Why dive here

    With 95+ marine species recorded in the area - including seals & sea lions, sea turtles and jellyfish lake - POSEIDON offers some of North Sea Coast's richest wreck diving. Water ranges 3-19°C, warmest July, August, September.

    Best timeJul–Aug
    WetsuitA 5mm wetsuit
    Marine lifeSeals & Sea Lions, Sea Turtles and Jellyfish Lake · 95+ species recorded
    Water3-19°C · warmest July, August, September
    CharacterWreck dive · max 15m

    The *Poseidon* isn't your typical colourful tropical dive, but it's a cracker for wreck enthusiasts, especially if you’re into the historical side of things. This old dredger went down in '72, capsizing near Kalundborg, and now she sits upright in about 15 metres, which makes for a pretty accessible dive. We love that you can still make out a lot of her structure, the superstructure is largely intact, and you can even poke around the holds if you're comfortable with light penetration. The North Sea might sound chilly, but the visibility here can be surprisingly good on a calm day, maybe 10-15 metres, enough to really appreciate the scale of her. It’s an artificial reef, of course, so expect plenty of the usual suspects: cod often cruise around the decks, and we’ve seen some decent-sized crabs tucked into nooks and crannies. The metalwork is draped in a tapestry of anemones and hydroids, a real contrast to the bare metal. It's an excellent site for photographers looking for that moody, atmospheric shot. Our tip? Go on an incoming tide when the water tends to be clearest. This isn't one for beginners; some currents can whip through, and you'll want solid buoyancy for navigating the wreck.

    Typical POSEIDON Dive Profile

    5m10m15mSafety Stop0m15m max~50 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 13°C). Drysuit or thick wetsuit (7mm+) recommended.

    Always perform a 3-minute safety stop at 5m before surfacing.

    Today06:3817:2810h 50m daylightGolden hour 16:37

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    Conditions

    Ocean conditions, forecast and tides for POSEIDON

    POSEIDON Ocean Conditions

    Monthly averages for POSEIDON, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (55.31, 9.86) (1km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    13°C

    56°F · Range: 10.7–16.8°C

    Air Temperature

    11°C

    52°F

    Wind Speed

    7.69 m/s

    14.9 knots

    Atmospheric Pressure

    1010.5 hPa

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

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