Peaks in FebRibbontailed StingrayTaeniura lymmaSeen nearby
7%of dives
Elasmobranchii
Photo: Jens Petersen, via Wikimedia Commons · CC BY 2.5 · taken elsewhere
Boat dive · Wreck
HTMS Sattakut
The HTMS Sattakut is a 46 m former warship, built in 1942 and present at Iwo Jima and Okinawa in WW2, that later served with the Thai Navy before being deliberately sunk off Koh Tao's west coast in 2011, close to the lone pinnacle Hin Pee Wee.
Also called 742, HTMS 742 Sattakut, HTMS Sattakut 742 Wreck, HTMS Sattakut Wreck, Hin Pee Vee, Hin Pee Wee, Hin Pee Wee/Sattakut Wreck, LCI 742, Landing Craft Infantry 724, Sattakut, Sattakut Wreck, Sattakut wreck, Wreck Sattakut
- Depth
- 18-31 m
- Level
- Advanced
- Visibility
- 18–30 m
- Water
- 28–31 °C
- Entry
- Boat dive
Seen here: Moon wrasse · Photo: Leonard Low from Australia, via Wikimedia Commons, CC BY 2.0 · not taken at this site
The verdict
A good dive, worth a day.
The HTMS Sattakut is a 46 m former warship, built in 1942 and present at Iwo Jima and Okinawa in WW2, that later served with the Thai Navy before being deliberately sunk off Koh Tao's west coast in 2011, close to the lone pinnacle Hin Pee Wee.
It sits upright on sand, with the deck at around 18 m and the stern reaching 31 m. Groupers, barracuda, trevally, batfish and Jenkins whiprays are regular sightings.
It is a standard Advanced-level boat dive, the superstructure should only be entered by trained divers, and light to moderate currents can sometimes cross the site.
Location
Map & nearby sites.
Interactive map loads here. Every site on it is also listed on this page.
Right now · updated 12 Nov 2026
November is a good month to dive.
November scores 7.9, against 8.0 in its best months. Live sea readings from NOAA Coral Reef Watch and NOAA WaveWatch III as of 10 Nov 2026.
Water30 °C+1.1° vs normalTick: normal for Nov, 28 °C
Visibility20 mtypical for NovPoor days 18 m · 1 day in 4 is worse
Waves1.2 mModerate6 s period
Reef stressNo stressNOAA Coral Reef Watch heat stress
When to go
Best Jul, Sep-Oct.
Every month gets its own Divegrade score from that month's marine life, visibility, reef and reviews. Across Koh Tao as a whole, the best months are Mar-May.
Divegrade score by monthPick a month for its full guide
Water temperatureSurfaceDive depth28–31 °C
Dec: warmer at dive depth than at the surface. Rain and cool winds chill the top few metres, and the warmer water sits below.
VisibilityBad day to great dayTypical10–36 m
How is this measured?
Mostly from years of satellite readings of how clear the water is around this site. Each bar runs from a bad day, which about 1 day in 10 is worse than, to a great day, which about 1 day in 10 beats; the line marks a typical day. Satellites can't see through cloud, so stormy days are underrepresented and the real bad days can be murkier. For 12 months here, local dive centers report worse days than the satellites see, so the bar starts at their figure. Logged dives will sharpen it over time.
Chance of seeing it on a dive, by monthThe big draws first, then the most frequent. Share of sampled dive days that recorded the species. Months with few dives on record lean on the months around them and the rest of the year, and are shown lighter. A dash means under 1 %.
| Species | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ribbontailed Stingray | 8 | 15 | 5 | 3 | 3 | 5 | 8 | 9 | 6 | 8 | 5 | 3 |
 Yellowtail barracuda | 1 | 1 | – | 1 | 1 | 2 | 4 | 3 | 6 | 1 | – | 1 |
 Green turtle | 3 | 6 | 2 | 1 | 1 | 2 | 4 | 3 | 1 | 1 | 4 | 2 |
 Orange-spotted Trevally | 3 | 2 | 2 | 2 | 3 | 9 | 16 | 8 | 7 | 9 | 3 | 2 |
 Yellow Spotted Trevally | 1 | 2 | 3 | 2 | 1 | 1 | 1 | 2 | 7 | 4 | 1 | 1 |
 Herring scad | 1 | 1 | – | 1 | 1 | 1 | – | 2 | 7 | 3 | 1 | 1 |
| Moon wrasse | 8 | 5 | 4 | 6 | 8 | 13 | 21 | 16 | 28 | 28 | 18 | 11 |
 Wimple Fish | 8 | 10 | 7 | 6 | 6 | 13 | 22 | 16 | 18 | 15 | 8 | 7 |
 Ringed Angle fish | 5 | 3 | 3 | 5 | 8 | 8 | 9 | 8 | 15 | 15 | 22 | 11 |
 Redbarred Roccod | 7 | 5 | 6 | 7 | 9 | 12 | 17 | 14 | 14 | 20 | 18 | 12 |
 Tropical Striped Triplefin | 3 | 2 | 2 | 3 | 4 | 11 | 20 | 10 | 6 | 7 | 3 | 2 |
 Briareum hamrum | 2 | 2 | 1 | 2 | 2 | 10 | 19 | 9 | 2 | 1 | 1 | 2 |
Marine life
What you'll see at HTMS Sattakut.
4.4Big draws. A shark, ray, turtle or other big draw on about 2 dives in 10 in the best months, most often ribbontailed stingray and yellowtail barracuda.
7.9Reef life. Variety: how many different species a few dives here turn up, compared with other sites.
The big draws first (sharks, rays, turtles, octopus and the like) when they turn up on at least 1 dive in 20 in their best month, then the regulars, ranked by how often divers record them across the year. Each percentage is the share of sampled dive days that recorded the species. Where this site has few records of its own, sightings from similar nearby sites (same side of the island, similar depth and exposure) are added at a lower weight and marked "seen nearby".
Peaks in Feb
Peaks in SepYellowtail barracudaSphyraena flavicaudaSeen nearby
2%of dives
Photo: Jens Petersen, via Wikimedia Commons · CC BY 2.5 · taken elsewhere
Peaks in FebGreen turtleChelonia mydasSeen nearby
2%of dives
Testudines
Photo: (c) Paul Asman and Jill Lenoble, some rights reserved (CC BY), uploaded by Paul Asman and Jill Lenoble · CC BY · taken elsewhere
Peaks in JulOrange-spotted TrevallyFlavocaranx bajadSeen here
5%of dives
Photo: portioid, via Wikimedia Commons · CC BY 4.0 · taken elsewhere
Peaks in OctMoon wrasseThalassoma lunareSeen nearby
14%of dives
Photo: Leonard Low from Australia, via Wikimedia Commons · CC BY 2.0 · taken elsewhere
Peaks in OctRedbarred RoccodEpinephelus fasciatusSeen nearby
12%of dives
Photo: Totti, via Wikimedia Commons · CC BY SA 4.0 · taken elsewhere
Photos
No photos yet.
None of HTMS Sattakut itself are licensed for us to use yet. Below: species recorded here, photographed elsewhere.
Diver reviews
No reviews yet.
Verified dives count more.
Reviews linked to a logged dive, and reviews from experienced divers, carry more weight in the score.
- 2.5×
- a review backed by a logged dive here, vs. one that isn't
- 2×
- a review from a 100-dive diver, vs. a first-timer's
Dived HTMS Sattakut?Sign up free to share how it went. Import your dive log and your review counts as verified.Share how it went. Divers with a logged dive here get the verified badge.
Nobody has reviewed HTMS Sattakut yet. Be the first: reviews from divers with a logged dive here count most.
Dive centers
Nine dive centers run HTMS Sattakut.
Confirmed: each lists this site on its own website. Listed alphabetically.
| DIVE CENTER | AGENCIES | NITROX | CONTACT | Action |
|---|---|---|---|---|
Big Blue DivingKoh Tao | SSI | Not known | Website+66 77 456 123 | View |
Dive Center "Scuba Birds"Koh Tao | PADI | Not known | Website+66990307571info@scubabirds.comOSM | View |
French Kiss Divers - ChalokKoh Tao | SSI | Yes | Website+66641276082frenchkissdivers@gmail.com | View |
Goodtime AdventuresKoh Tao | SSI | Yes | Website+66872753604OSM | View |
Hydronauts Diving ResortKoh Tao | RAID | Not known | Website+ 66 080 065 8782OSMinfo@hydronautsdiving.comOSM | View |
KTD - Koh Tao DiversKoh Tao | SSI, TDI | Not known | Website | View |
Nava Scuba DivingKoh Tao | PADI | Yes | Website+66 77 601198OSMinfo@navascuba.comOSM | View |
Siam Scuba Dive CenterKoh Tao | BSAC, CMAS, NAUI, PADI, RAID, SSI | Not known | Websitesiamscubadivep@gmail.comOSM | View |
The Dearly Dive Koh TaoKoh Tao | PADI, RAID, SSI | Not known | Website+66-(0)77-332-494info@thedearlykohtaohostel.com | View |
Not confirmedEight more centers likely dive here
These centers run trips to sites near HTMS Sattakut or are based within 10 km, but their own websites don't name HTMS Sattakut. Ask them before you book. Run trips here? Claim your listing and add it.
| DIVE CENTER · WHY LISTED | AGENCIES | NITROX | CONTACT | Action |
|---|---|---|---|---|
Crystal DiveNot confirmed Runs trips to White Rock, 250 m away | SSI | Yes | Website | View |
Dive Poin Koh TaoNot confirmed Runs trips to Japanese Gardens, 1.3 km away | SSI | Yes | Website+66 77456231OSM | View |
New Heaven Dive SchoolNot confirmed Runs trips to Japanese Gardens, 1.3 km away | SSI | Not known | Website+66 77 457 045info@newheavendiveschool.com | View |
Nang Yuan Easy DiversNot confirmed Based 1.6 km awayOSM | Not listed | Not known | Website | View |
Apnea TotalNot confirmed Based 1.7 km awayOSM | Not listed | Not known | Website | View |
New Way DivingNot confirmed Based 1.7 km awayOSM | Not listed | Not known | Website+66 77 456 527OSMinfo@newwaydiving.comOSM | View |
Rainbow Fish DiversNot confirmed Based 1.9 km awayOSM | Not listed | Not known | Website+66 89-521-7738OSMstefan@rainbowfishdivers.comOSM | View |
Freedive Koh TaoNot confirmed Based 2.0 km awayOSM | Not listed | Not known | Websiteinfo@freedivekohtao.comOSM | View |
OSM From OpenStreetMap (© OpenStreetMap contributors, ODbL), not from the center's own website.
Safety & rules
Know before you drop.
Depth, current and certification are safety calls. This isn't a dive briefing: your guide gives that on the boat or at the entry.
Hazards
No specific hazards recorded. That doesn't mean there are none: ask locally.
Rules and requirements
- Who can dive it
- Advanced Open Water (or equivalent), typically to 30 m. Koh Tao sites for Advanced Open Water divers
- Local rules
- No specific rules recorded.
- Park fee
- None known
- Depth limits
- The site goes past 30 m, the usual recreational limit. Plan your depth with your guide and set your computer's ppO₂ alarm if you dive nitrox.
- Sources
- Dive center websites, derived, gbif locality, NOAA Coral Reef Watch and NOAA WaveWatch III.
If a diver is hurt: oxygen first, then call for helpFor suspected decompression sickness give 100% oxygen right away and contact local emergency services. DAN emergency hotline: +1 919 684 9111. Check where the nearest recompression chamber is before you travel, and carry dive insurance with evacuation cover.
Questions
When is the best time to dive HTMS Sattakut?
July, September, October score highest for HTMS Sattakut.
What certification do you need for HTMS Sattakut?
Advanced Open Water. Advanced Open Water (or equivalent), typically to 30 m. Depth 18-31 m.
How we grade
One number, built from dives people actually logged.
- Big draws or varietyMarine life scores the better of two things: how often sharks, rays, turtles and other big draws turn up, and how varied the reef life is, plus a little for having both. Both are per dive, so busy sites can't win on volume.
- By monthEvery month has its own score. Pick a month to see yours.
- Thin data, cautious scoreFew dives or reviews? The score leans toward the regional average.
- Graded as a wreckThe wreck itself counts for 35% of the score and marine life 20%. Heat stress on coral does not apply to the wreck's own grade.
- Reef healthThe reef score counts coral variety, and recent marine heatwaves that bleach coral take up to 3 points off it, fading over the years after as the reef recovers.
- Hard isn't worseCurrent and depth are shown on their own. A tough site can still score 10.
Sources for this page
Site facts: Dive center websites, derived, gbif locality, NOAA Coral Reef Watch and NOAA WaveWatch III. Occurrence data from GBIF.org; sea conditions from NOAA Coral Reef Watch and Copernicus Marine. Score computed 12 Nov 2026 from 99 logged dives and 0 reviews: medium confidence.
Water temperature: average surface temperature by month from NOAA OISST climatology; at a typical dive depth here from the E.U. Copernicus Marine Service ocean reanalysis. Visibility: NASA satellite water-clarity data, local dive center reports and logged dives.