Thailand's best dive sites in one day — speedboat from Samui, two dives, Nang Yuan island
Koh Tao (Turtle Island) is one of the most popular diving destinations in the world. This small island in the Gulf of Thailand is surrounded by coral reefs, underwater pinnacles, and rock formations that attract an incredible diversity of marine life. More divers are certified here than anywhere else on the planet. From Koh Samui, you can reach Koh Tao by speedboat in 1.5-2 hours, allowing a full dive trip in a single day.
Diving from the speedboat, no beach stop. 09:00 — briefing and first dive at one of Koh Tao's dive sites. Surface interval, lunch on the speedboat between dives. Second dive at a different site. 15:00 — return to Samui. Two dives at different sites in one day.
2 dives at different sites. Full equipment set. Insurance. Russian-speaking instructor. Lunch between dives. Transfer paid separately or self-arranged.
We choose the best sites depending on conditions, group skill level, and current marine life
The king of Koh Tao dive sites. A group of massive granite rocks rising from 36 meters to 14 meters from the surface. Home to huge schools of bigeye trevally creating a 'wall' of silver fish. Whale sharks appear regularly in season (March—September). At depth, reef sharks, giant groupers, and rays reside. Strong currents bring nutrients, attracting pelagic predators.
Seven underwater rocks southwest of Koh Tao, covered with vibrant anemones and soft corals. Top at 6 meters, bottom at 26 meters. One of the most photogenic dive sites in the region. Pink and purple anemones with clownfish, huge moray eels peeking from crevices, schools of barracuda at depth. In season (April—June) whale sharks can also be spotted here.
The most visited dive site on Koh Tao — and for good reason. Two large boulders with coral gardens at depths from 2 to 22 meters. Perfect for night diving — porcupinefish, crabs, shrimp, and octopuses hunt here. During the day you can spot turtles, angelfish, butterflyfish, triggerfish, and green moray eels. Suitable for all diver levels. Currents are usually mild.
Two underwater boulders between Nang Yuan islands and Koh Tao. Depth from 2 to 18 meters. 'Twins' is an underwater garden with incredible coral diversity: table, staghorn, brain, and fire corals. Between the boulders is a sandy bottom where rays and reef sharks often rest. Excellent visibility, mild currents, vivid colors — perfect for underwater photography and training.
A coral garden at the base of Nang Yuan island. A gentle slope from 2 to 16 meters depth, studded with hard corals and anemones. Perfect for snorkeling and beginner divers. Home to schools of butterflyfish, clownfish in anemones, blue tangs, parrotfish, and cornetfish. Calm water, excellent visibility — the best spot for a first dive or relaxed reef drift.
A rocky islet shaped like a shark's fin at the southern tip of Koh Tao. Underwater — steep slopes covered with soft corals, gorgonians, and sponges. Depth from 2 to 22 meters. The east side features a wall with cracks where moray eels and crabs hide. The west side has a gentler slope with anemone gardens. One of the best places to encounter sea turtles — hawksbill and green turtles feed here regularly.
The waters around Koh Tao are among the most biodiverse in the Gulf of Thailand. Here's who you may encounter during your dives.
The largest fish on Earth visit Koh Tao waters March to September. Up to 12-18 meters long. Most commonly at Chumphon Pinnacle and Sail Rock. Peaceful filter feeders, completely safe.
Koh Tao (Turtle Island) got its name for a reason. Green and hawksbill turtles are permanent reef residents. Found at Shark Island, White Rock, and Japanese Garden. Accustomed to divers.
Longfin batfish are among the most recognizable reef inhabitants of Koh Tao. Curious and friendly, they approach divers at arm's length. Schools of fusiliers, jacks, and rainbow runners create a silver backdrop on every dive.
Lionfish with their luxurious fan-like fins are true underwater photography models. Giant moray eels peek from crevices with gaping toothy mouths. On night dives, lionfish hunt in flashlight beams — one of the most spectacular nocturnal sights.
Titan triggerfish are signature Koh Tao reef inhabitants. Butterflyfish, angelfish, parrotfish, blue tangs (like Dory), clownfish in anemones — the reef life diversity here is astounding. You can count over 50 species on a single dive.
Thousands of chevron barracuda form spirals and 'tornadoes' around pinnacles. Bigeye trevally gather in dense schools creating a silver wall. At Chumphon Pinnacle and Southwest Pinnacle these spectacles are commonplace. Reef sharks patrol the bottom at 20-30 meters.
Diving at Koh Tao is possible year-round, but each season has its own character
Perfect season. Visibility 15-30 meters, calm sea, water temperature 28-30°C. Maximum chance of whale shark encounters at Chumphon Pinnacle. Best time for training — conditions comfortable for all levels. Book 2-3 days ahead.
Rainy season, but diving still possible. Visibility 10-20 meters. Waves may be higher, site selection depends on weather. However, increased whale shark chances! Accommodation prices are lower.
End of monsoon season, sea gradually calms. Visibility recovers to 15-25 meters. Good time for training — fewer tourists, smaller groups. Water temperature 27-29°C. Recommended for those who prefer less crowded sites.
Koh Tao is the world capital of dive training. More divers get certified here than anywhere else on the planet. We offer PADI courses from introductory dives to Divemaster — in Russian and English.
Nang Yuan dive trip: 3,500 ฿ (diver), 2,000 ฿ (certified diver with own gear), 400 ฿ (snorkeler). Open Water course at Koh Tao: 11,000 ฿. Price includes hotel transfer, boat, equipment, 2 dives, and lunch.
Best season is March-September: visibility up to 30 meters, calm sea, 28-30°C water. Whale sharks most common March-June. Year-round diving possible, but October-December may have waves and limited site choice.
Speedboat from Nathon or Bophut pier — 1.5-2 hours. We arrange hotel transfer (departure 06:30). Return around 17:00. Multi-day trips with overnight stay on Koh Tao available — price discussed individually.
For a dive trip — yes, minimum PADI Open Water Diver (or equivalent). For snorkeling at Nang Yuan — no. You can also take the Open Water course right at Koh Tao in 3 days and get an international certificate.
Yes! Whale sharks regularly appear at Chumphon Pinnacle and Sail Rock from March to September. These are gentle giants up to 18 meters long that feed on plankton. Encounters aren't guaranteed, but chances are high in season — our instructors know the best spots.
Snorkeling at Nang Yuan — excellent for families with children of any age. Diving: Bubblemaker (8+, up to 2m), Junior Open Water (10+, up to 12m). Lunch, drinks, and life vests for everyone on board.
Message us — we'll find the best date and dive sites for your level
