Dive Sail Rock
Hin Bai - the legendary pinnacle. Whale shark territory, the famous vertical Chimney swim-through, and massive schools of fish. A full-day boat trip from Koh Tao, every 3 days.
★ Google 4.9 (845 reviews) · TripAdvisor 5.0 (776 reviews)
Why Sail Rock is unmissable
A 90-minute boat ride into open water rewards you with the richest marine life in the Gulf - and the single best chance in Thailand to swim with a whale shark.
Whale shark chance
The Gulf's top spot to encounter the gentle giants - Sail Rock draws them in.
The Chimney
A thrilling vertical swim-through cutting down through the pinnacle - a signature dive.
Walls of fish
Barracuda tornadoes, trevally, batfish and huge schools swirling around the rock.
3 dives in a day
Two dives at Sail Rock plus a stop at Shark Island - a complete day on the water.
- ✓Full dive gear & tanks (180-200 bar)
- ✓Private boat, experienced guides
- ✓Breakfast + Thai lunch buffet on board
- ✓Coffee, tea, fresh fruit, cookies
- ✓Dive insurance included
- ✓For certified divers
Your day on the boat
4.9 on Google (845) · 5.0 on TripAdvisor (776).
See what divers say after a day on the Sail Rock boat with us.
Based on 776+ verified reviews on Tripadvisor
"There are so many dive schools in Koh Tao and this one is definitely the best. The friendliest instructor ever — best day of our trip!"
Sarah M.
🇬🇧 United Kingdom · March 2026
"Our instructors Chris and Noah were incredible — kind, helpful, funny and patient. We owe a huge thanks to Siam Scuba, easily one of the nicest dive shops in Koh Tao."
The Johnson Family
🇺🇸 United States · February 2026
"Fantastic experience. The staff were incredibly kind and welcoming. Small group meant I got tons of personal attention. Certified in 4 days and already planning my next dive."
Lucas R.
🇩🇪 Germany · January 2026
Pick your Sail Rock day
Reserve a spot with a deposit - we confirm the same day.
Frequently asked
The next boat leaves Thu, Aug 6
Spots on the Sail Rock boat are limited and fill fast. Reserve yours now.
Book the Sail Rock Trip