34m
    Istria Peninsula, Croatia

    HM MGB 663

    Best months: Jul–Aug

    Why dive here

    With 46+ marine species recorded in the area - including dolphins, sea turtles and cuttlefish - HM MGB 663 offers some of Istria Peninsula's richest wreck diving. Water ranges 12-26°C, warmest July, August, September.

    Best timeJul–Aug
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeDolphins, Sea Turtles and Cuttlefish · 46+ species recorded
    Water12-26°C · warmest July, August, September
    CharacterWreck dive · max 34m

    The HM MGB 663 sits upright at 34 metres, a proper old gunboat that makes for a cracking dive. We love the way it’s settled on the seabed, almost as if it’s still on patrol, just a bit… sleepy. Dropping down, you’ll first notice the outline of the stern, remarkably intact, with the deck guns still pointing skyward, coated in thick layers of yellow and purple sponges. It’s not a huge wreck, but there’s plenty to explore. We always enjoy poking around the wheelhouse, now home to clouds of tiny glassfish, their silver scales flickering in your torch beam. Look closely for scorpionfish camouflaged on the hull plates, and we often spot conger eels peeking from beneath twisted metal. The bow section has seen better days, showing clear signs of the mine blast, but even here, anemones cling to every surface. We’d suggest saving this one for a calm day, as the visibility can drop with a swell, and aim for a morning dive before any boat traffic kicks up the particulates. It’s a dive that suits those who appreciate a bit of history with their marine life, a quiet exploration of a moment frozen in time.

    Typical HM MGB 663 Dive Profile

    15m30mSafety Stop0m34m 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 (34m) - 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.

    Today06:1917:3311h 14m daylightGolden hour 16:53

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    Conditions

    Ocean conditions, forecast and tides for HM MGB 663

    HM MGB 663 Ocean Conditions

    Monthly averages for HM MGB 663, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (45.08, 14.15) (21km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    20°C

    68°F · Range: 18.4–22.3°C

    Current Speed

    3.16 cm/s

    Direction: W (288.4°)

    Salinity

    37.74 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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