Train, dive, and qualify in three action-packed days on Koh Tao. This open water course combines classroom sessions, confined-water drills, and open-ocean dives to 18m at calm, clarity-rich sites.
More ways to explore the area's outdoor wonders
The boat eases away from Mae Haad as the island shrinks into a band of palms and rock. Salt air sharpens the brain while instructors run through checks; beneath the surface a limestone reef waits, its fingers splayed toward the sun. Over three days on Koh Tao, students move from classroom to confined-water practice to two open-ocean dives that qualify them to 18 meters.
Difficulty
moderate
Duration
3 days
Fitness Level
Moderate cardio and mobility—able to swim 200m and handle repeated water entries; some surface swimming required.
Wildlife
History
Koh Tao was a small fishing and agricultural community that transformed into a diving hub in the late 20th century; its name means “turtle island,” referencing local marine life.
Conservation
Reefs here are sensitive—use reef-safe sunblock, avoid touching coral, and choose operators that follow no-touch policies and proper buoyancy training.
Reserve your spot on the Open Water Course - Become certified diver in 3 days today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Hydrate and Rest
Drink plenty of water and prioritize sleep between sessions—dehydration increases the risk of decompression sickness.
Practice Equalization
Start equalizing on descent frequently; uncomfortable ears slow progress and can end a dive early.
Bring a Fitted Mask
A personal mask that seals well saves time and reduces fogging during skill drills.
Use Reef-Safe Sunscreen
Apply mineral-based sunscreen before and after dives to protect coral and comply with local conservation guidelines.
Well-fitted dive mask
Improves visibility and comfort during confined-water drills and open dives.
Reef-safe sunscreen
Protects skin and fragile coral ecosystems in tropical waters.
Shorty wetsuit (3–5mm) or rashguard
Provides thermal comfort for repeated dives in warm water and protects against scrapes.
Towel and quick-dry clothing
Useful between sessions on boats and for changing at the school.