20-40m
    Portofino & Liguria, Italy
    Fondali Punta Apicchi

    HMS Simoom

    Best months: Jul–Aug

    Protected Area

    Fondali Punta Apicchi

    Why dive here

    With 70+ marine species recorded in the area - including blue sharks, dolphins, humpback whales, mobula rays (devil rays) and oceanic whitetip sharks - HMS Simoom offers some of Portofino & Liguria's richest wreck diving. Water ranges 14-27°C, warmest July, August, September.

    Best timeJul–Aug
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBlue Sharks, Dolphins, Humpback Whales, Mobula Rays (Devil Rays) and Oceanic Whitetip Sharks · 70+ species recorded
    Water14-27°C · warmest July, August, September
    CharacterWreck dive · max 20-40m
    StandoutRich in charismatic marine life

    The HMS Simoom, a British S-class submarine, met its end in 1943 off the coast of Portofino, and diving it feels like stepping back in time. You drop down onto the deck, the torpedo tubes still eerily visible, a stark reminder of its purpose. We love how the Mediterranean gorgonians have taken hold, painting the metal hull in shades of red and orange, with schools of damselfish flitting through the conning tower. It’s a pretty deep dive, so definitely one for experienced wreck divers who are comfortable with decompression stops. Our favourite spot is exploring the stern, where you can often spot curious cowfish peeking out from behind the encrusted plating. Visibility here can vary, but on a good day, the shaft of light hitting the wreck from above is just incredible, making the whole scene feel almost sacred. Keep an eye out for the elusive devil fish gliding past in the blue. It’s not a site for beginners, but for those with the training, the Simoom offers a genuinely evocative and rewarding dive.

    Typical HMS Simoom Dive Profile

    10m20mSafety Stop0m20m max~30 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

    Depth of 20m - Advanced Open Water 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.

    Today06:3217:4811h 15m daylightGolden hour 17:09

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    Conditions

    Ocean conditions, forecast and tides for HMS Simoom

    HMS Simoom Ocean Conditions

    Monthly averages for HMS Simoom, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (44.38, 9.02) (43km away)

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    October Averages

    Sea Temperature

    21°C

    70°F · Range: 19–23.2°C

    Air Temperature

    18°C

    64°F

    Wind Speed

    4.49 m/s

    8.7 knots

    Atmospheric Pressure

    1017.3 hPa

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

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