HM MGB 657
Why dive here
With 46+ marine species recorded in the area - including dolphins, sea turtles and cuttlefish - HM MGB 657 offers some of Istria Peninsula's richest wreck diving. Water ranges 12-26°C, warmest July, August, September.
We love the HM MGB 657 wreck for its simplicity and historical punch. It’s sitting upright in just 12 meters, making it incredibly accessible, even for newer divers or those who just want a long, relaxed bottom time. You can trace its entire 33.5-meter length, picturing the crew on patrol back in '44 before that mine hit. The MGB 657 is now a home for moray eels tucked into the superstructure and schools of damselfish flitting around the old gun mounts. We always enjoy spotting octopus camouflaged against the hull plating; sometimes they're right out in the open, pretending to be part of the wreck itself. Because it's so shallow, light penetration is excellent, illuminating the details of the gunboat and creating a shimmering effect on the metal. It’s not about grand scale here; it's about the tangible history and the way marine life has reclaimed it. Our favourite time to dive it is early morning before the boat traffic picks up, when the visibility often feels a little crisper.
Typical HM MGB 657 Dive Profile
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.
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to HM MGB 657
Dive shops near HM MGB 657
Sub Riccione
DIVING WORLD SAN MARINO
Sub Tridente
IDENTICI DIVING SCHOOL RAVENNA A.S.D.
ASD Cormorano Sub Forli
SUB ATLANTIDE FORLI’
Reviews for HM MGB 657
Conditions
Ocean conditions, forecast and tides for HM MGB 657
HM MGB 657 Ocean Conditions
Monthly averages for HM MGB 657, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (45.08, 14.15) (21km away)
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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