HMS Stygian

Best months: Jan–May

Why dive here

With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - HMS Stygian offers some of Similan Islands's richest wreck diving. Water ranges 29-31°C, warmest April, May, June.

Best timeJan–May

WetsuitA 3mm shorty or thin full wetsuit

Marine lifeBlacktip Reef Sharks, Eagle Rays, Giant Moray Eels, Whale Sharks and Clownfish · 173+ species recorded

Water29-31°C · warmest April, May, June

CharacterWreck dive

StandoutExceptional marine biodiversity

The HMS Stygian, a 1943 S-class submarine, isn't just a dive site; it’s a time capsule. Dropping down, you really feel the history of the place. We love the way the hull’s silhouette takes shape, a stark contrast to the usual Similan granite boulders. Inside, the torpedo tubes are still visible, and you can imagine the crew in those cramped quarters. Schools of fusiliers often swirl around the conning tower, so thick they almost block out the light, a real sensory overload. Our favourite part is lingering near the bow, watching the resident giant morays peek out from crevices that used to be watertight compartments. The wreck's integrity, even after all these years, is remarkable. It’s a dive for those who appreciate both history and the way the ocean reclaims man-made structures. Best dived mid-morning to catch the light shafting through the open sections, illuminating the colourful soft corals that now carpet the metal.

Safety Notes

Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

Today06:1118:1212h 1m daylightGolden hour 17:45

Reviews for HMS Stygian

Conditions

Ocean conditions, forecast and tides for HMS Stygian

HMS Stygian Ocean Conditions

Monthly averages for HMS Stygian, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)