Get certified in three days on Koh Tao with the SSI Open Water Diver course. Learn classroom basics, confined-water skills, and complete six open-water dives to earn a globally recognized license.
More ways to explore the area's outdoor wonders
The boat rocks a little as you shoulder your kit and peer over water the color of green glass. Koh Tao’s shorelines tighten into coves and coral gardens; the instructor’s voice cuts through the hum of the outboard, directing you through first checks before you slip beneath the surface and the island blurs into a world of light and current.
Difficulty
moderate
Duration
3 days
Fitness Level
Moderate fitness; comfortable swimming ability and basic stamina for multiple surface swims and boat transfers
Wildlife
History
Koh Tao transformed from a sparsely populated fishing island into a dive center in the late 20th century, driven by affordable training and a dense concentration of reefs.
Conservation
The area is part of regional marine protected efforts; responsible divers should avoid contact with coral, use reef-safe sunscreen, and support local reef restoration initiatives.
Reserve your spot on the SSI Open Water Diver today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Hydrate before the boat
Drink plenty of water the day before and the morning of your dives to reduce dehydration and the risk of decompression sickness.
Bring a personal mask
Rentals are available but a well-fitting personal mask speeds skill practice and reduces fogging interruptions.
Time your days for calm seas
Book morning sessions when winds are lighter—afternoon trade winds can make boat rides and surface intervals choppier.
Use reef-safe sunscreen
Protect skin without harming coral—choose mineral sunscreens and apply before entering the water.
Personal dive mask
A good-fitting mask improves comfort and visibility during skills and dives.
Swimwear/ Rashguard
Protects skin from sun and minor scrapes during boat transfers and surface swims.
Dive logbook
Record your qualifying dives and instructor sign-offs for certification records.
Sea sickness medication
Use preventatively if you’re prone to motion sickness; take before boarding.