HMS Suddhadib
Protected Area
Chonburi Environmental Protected Area
Why dive here
With 54+ marine species recorded in the area - including sea turtles, tiger sharks and pufferfish - HMS Suddhadib offers some of Koh Tao's richest wreck diving. Water ranges 29-31°C, warmest April, May, June.
The HMS Suddhadib, or HTMS Sattakut as it’s often called, is one of those wrecks that just has *character*. Sunk deliberately in 2011 to create an artificial reef, it’s a former WWII patrol boat, sitting upright in about 30 metres of water. We love the way she’s already been completely claimed by the ocean, covered in whip corals and sponges, with big schools of yellow-tail barracuda circling the mast. Entering the wheelhouse at 18 metres is our favourite part; light streams through the windows, illuminating glassy sweepers and cardinalfish darting between the decaying consoles. Further down, the deck guns at the bow and stern are impressive, often with a giant trevally or two lurking nearby. We usually aim for an early morning dive here to beat the crowds, or a late afternoon one when the light softens. It’s a great dive for advanced open water divers looking for a bit more depth and the thrill of exploring penetration points, though even a loop around the exterior offers plenty to see. Just watch for stronger currents that can sometimes sweep across the bow.
Safety Notes
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
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Conditions
Ocean conditions, forecast and tides for HMS Suddhadib
HMS Suddhadib Ocean Conditions
Monthly averages for HMS Suddhadib, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (11.17, 101.33) (40km away)
October Averages
Sea Temperature
30°C
86°F · Range: 29.1–31.1°C
Current Speed
7.07 cm/s
Direction: E (98.1°)
Salinity
31.67 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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