Smalltooth Emperor near No Name

Boat dive · Wreck

No Name

This boat dive on Koh Tao centers on the wreck of the HTMS 313 Suphairin, which sits about 15 m from No Name Pinnacle, so the two are often dived together.

Also called 313, HTMS 313 Suphairin, HTMS Supairin 313, HTMS Suphairin, HTMS Suphairin 313, HTMS Suphairon, Koh Tao Shipwreck, No Name Pinnacle, No Name Pinnacle with the Suphairon Wreck, Suphairin 313, Suphairin wreck, Suphairon Wreck

Depth
11-30 m
Level
Advanced
Visibility
18–30 m
Water
28–31 °C
Entry
Boat dive

Is it right for you?

Compare 6 dive centers
1 photo
The verdict

A good dive, worth a day.

This boat dive on Koh Tao centers on the wreck of the HTMS 313 Suphairin, which sits about 15 m from No Name Pinnacle, so the two are often dived together. Depths run from about 11 m down to 30 m, and advanced certification is the usual requirement.

Nudibranchs dominate the nearby records, including the mourning dorid, elegant phyllidia and varicose wart slug, and smalltooth emperor have also been seen in the area. It suits divers who want a wreck and a pinnacle in one dive.

Wreck diving in Koh Tao
Location

Map & nearby sites.

Interactive map loads here. Every site on it is also listed on this page.

10.1200° N, 99.8076° EBoat dive · Koh Tao, ThailandOpen in Google Maps
Nearby sites straight-line distance, nearest first
Right now · updated 12 Nov 2026

November is a good month to dive.

November scores 7.4, against 7.5 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

Diving in Koh Tao in November

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
JanFebMarAprMayJunJulAugSepOctNovDec
Water temperatureSurfaceDive depth28–31 °C
31°29.5°28°JFMAMJJASOND
VisibilityBad day to great dayTypical10–36 m
45255 mJFMAMJJASOND
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 %.
Marine life at No Name: percent chance per dive, by month
SpeciesJanFebMarAprMayJunJulAugSepOctNovDec
Ribbontailed Stingray795214753475
Orange-spotted Trevally2111134512522
Redbarred Roccod12774510171626272219
Yellow Scale Parrotfish1177448121527221817
Wimple Fish86533102120251697
Vielle Chocolat6323581213241376
Doublebar Rabbitfish97422591322959
Chocolate Hind6432391815211696
White-dotted maori wrasse6573371313191276
Moon wrasse6322381481519126
Titan triggerfish10125234591319158
Regal Demoiselle43222587191364
Marine life

What you'll see at No Name.

2.6Big draws. A shark, ray, turtle or other big draw on about 1 dive in 10 in the best months, most often ribbontailed stingray and orange-spotted trevally.
7.4Reef 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".

296 species likely at No Name: 43 recorded here, 253 at similar sites nearby, from divers' logs, GBIF and iNaturalist. iNaturalist observations by their observers, CC BY SA 4.0 and CC0 1.0.See them by month
Photos

1 photo. All from this site.

Diver reviews

No reviews yet.

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Reviews linked to a logged dive, and reviews from experienced divers, carry more weight in the score.

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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
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Nobody has reviewed No Name yet. Be the first: reviews from divers with a logged dive here count most.

Dive centers

Six dive centers run No Name.

Confirmed: each lists this site on its own website. Listed alphabetically.

Dive centers whose own websites list No Name
DIVE CENTERAGENCIESNITROXCONTACTAction
Big Blue DivingKoh Tao
SSINot knownWebsite+66 77 456 123View
Goodtime AdventuresKoh Tao
SSIYesWebsite+66872753604OSMView
Hydronauts Diving ResortKoh Tao
RAIDNot knownWebsite+ 66 080 065 8782OSMinfo@hydronautsdiving.comOSMView
KTD - Koh Tao DiversKoh Tao
SSI, TDINot knownWebsiteView
Nava Scuba DivingKoh Tao
PADIYesWebsite+66 77 601198OSMinfo@navascuba.comOSMView
Siam Scuba Dive CenterKoh Tao
BSAC, CMAS, NAUI, PADI, RAID, SSINot knownWebsitesiamscubadivep@gmail.comOSMView

Not confirmedEight more centers likely dive here

These centers run trips to sites near No Name or are based within 10 km, but their own websites don't name No Name. Ask them before you book. Run trips here? Claim your listing and add it.

Dive centers that likely dive No Name, not confirmed
DIVE CENTER · WHY LISTEDAGENCIESNITROXCONTACTAction
Crystal DiveNot confirmed Runs trips to Twins, 700 m away
SSIYesWebsiteView
Dive Center "Scuba Birds"Not confirmed Runs trips to Twins, 700 m away
PADINot knownWebsite+66990307571info@scubabirds.comOSMView
Dive Poin Koh TaoNot confirmed Runs trips to Twins, 700 m away
SSIYesWebsite+66 77456231OSMView
French Kiss Divers - ChalokNot confirmed Runs trips to Twins, 700 m away
SSIYesWebsite+66641276082frenchkissdivers@gmail.comView
The Dearly Dive Koh TaoNot confirmed Runs trips to Green Rock, 750 m away
PADI, RAID, SSINot knownWebsite+66-(0)77-332-494info@thedearlykohtaohostel.comView
New Heaven Dive SchoolNot confirmed Runs trips to Japanese Gardens, 1.1 km away
SSINot knownWebsite+66 77 457 045info@newheavendiveschool.comView
Nang Yuan Easy DiversNot confirmed Based 850 m awayOSM
Not listedNot knownWebsiteView
New Way DivingNot confirmed Based 3.4 km awayOSM
Not listedNot knownWebsite+66 77 456 527OSMinfo@newwaydiving.comOSMView

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
Sources
Dive center websites, derived, geoparse, 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 No Name?

July, September, October score highest for No Name.

What certification do you need for No Name?

Advanced Open Water. Advanced Open Water (or equivalent), typically to 30 m. Depth 11-30 m.

Destination · Koh TaoDiving in Koh Tao.Best Mar-May5 days of diving23 graded sitesThailandOpen the Koh Tao guide
How we grade

One number, built from dives people actually logged.

Never paid for. Dive centers can reply, not change a score.
  • 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, geoparse, 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 79 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.

Photo credits

Smalltooth Emperor near No Name: (c) ig: underwater.logs, some rights reserved (CC BY), via iNaturalist (CC BY).