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I dove the HTMS Sattakut in August 2026 with Big Blue Diving, by boat out of Koh Tao, Thailand.
It is the best known wreck dive on Koh Tao, and it still has both of its guns.
The wreck sits next to Boulders, close enough that the two get dived together on one tank.
That is how I dove it, so the log below covers both sites.
HTMS Sattakut
The wreck sits off the southwest side of the island, roughly 40 metres south of the Hin Pee Wee pinnacle.
Big Blue pair it with Southwest Pinnacle on the same morning trip, out at 07:30 and back by 12:30.
About the Wreck
The Sattakut was built in 1942 and served with the Royal Thai Navy before she was sunk deliberately in June 2011.
She is roughly 48 metres long and sits upright on the seabed.
Koh Tao operators put the top of the wreck at around 60 feet (18 m), with the seabed at 100 feet (30 m) or so at the stern.
My deepest point was 83 feet (25.3 m), which is deck and gun level rather than down on the sand.
The Guns
The bow gun is the reason people dive this wreck.
It is still mounted, still pointing out, and the barrel is intact.
There is a second gun at the stern.
Wreck Penetration
Penetration is possible here, but you need a wreck diver certification to do it.
Big Blue would not let me inside without one, and the guides were strict about it.
That means I have no footage from inside the hull, only what I could shoot through the openings.
If you want to go inside these wrecks, get your wreck certification done before you arrive or pick it up on the island.
What the Wreck Holds
The wreck is covered in fusiliers, and they move over the superstructure in a constant stream.
Dive Conditions
Water temperature averaged 86°F (30°C).
Let's Dive Together
👋 It's Divemaster Austin
I'm inviting you to Dive Club, my global scuba diving community.
What you’ll find inside:
🤿 Dive meetups & group trips
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See you there!
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