Earn an SSI Open Water certification on Koh Tao in about 2.5 days, learning theory, confined-water skills and five open-water dives. This course is ideal for first-time divers seeking small-group instruction in calm, fish-rich waters.
More ways to explore the area's outdoor wonders
Wet air and salt first hit your face as you step off the pier at Mae Haad — a warm breeze, the chatter of other divers, and the sea that dares you to breathe beneath it. On Koh Tao, known for shallow reefs and calm bays, the Open Water Course unfolds across classroom sessions, confined-water practice and five open-water dives that take place over roughly 2.5 days.
Difficulty
moderate
Duration
2–3 days
Fitness Level
Light to moderate fitness; must be comfortable in open water and able to swim short distances
Wildlife
History
Koh Tao’s dive industry expanded in the 1990s when affordable certification courses and calm dive sites attracted international students, transforming the island’s economy.
Conservation
Marine conservation is active here; many operators support reef clean-ups and enforce no-touch, no-take rules to protect fragile coral communities.
Reserve your spot on the Open Water Course today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Hydrate and rest before arrival
A full night’s sleep and steady hydration reduce seasickness and fatigue during surface intervals.
Bring reef-safe sunscreen
Koh Tao has sensitive coral; use biodegradable or mineral-based SPF to protect reefs and your skin.
Practice basic swim skills
Be comfortable swimming 200m and treading water for 10 minutes to meet course demands and stay relaxed during drills.
Label your gear
Mark masks and fins — small gear mix-ups are common at busy dive shops and piers.
Mask and snorkel
Better-fit personal masks reduce fogging and speed up skill learning.
Shorty wetsuit (3mm) or rashguard
Thin protection for cooler mornings and protection from scrapes on rocky entries.
summer
Reef-safe sunscreen and sunhat
Protects skin during surface intervals and helps preserve coral health.
summer
Logbook or dive computer
Records your dives and helps track depth/time limits as you progress beyond certification.