DivePlnr
    Hammerhulerne dive site
    cave
    10-25m
    Bornholm, Denmark
    Davids Banke

    Hammerhulerne

    Best months: Jul–Sep

    Protected Area

    Davids Banke

    Why dive here

    With 66+ marine species recorded in the area - including jellyfish lake - Hammerhulerne offers some of Bornholm's richest cave 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
    CharacterCave dive · max 10-25m
    StandoutDramatic cave topography

    Hammerhulerne offers a unique freshwater cave diving experience in Bornholm. The site features several small, interconnected caves and overhangs, perfect for divers comfortable in enclosed environments. Visibility can vary, but on a good day, the light plays nicely through the openings. It's a site best suited for experienced divers looking for something a bit different from typical reef dives.

    Typical Hammerhulerne 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

    Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.

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

    Today06:2317:1410h 51m daylightGolden hour 16:24

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    Conditions

    Ocean conditions, forecast and tides for Hammerhulerne

    Hammerhulerne Ocean Conditions

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

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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