Big Blue Diving Koh Tao

Big Blue Diving is a dive school on Sairee Beach on Koh Tao, open daily from 8am to 7pm. It has run on the island since 1991 and operates its own fleet of dive boats, with trips that include Sail Rock.

Training runs under SSI, where the school holds Diamond Center status, alongside SDI and TDI for technical courses. Beginners can choose Basic Scuba Diver, Scuba Diver or Open Water Diver, and there are kids' courses, Advanced, Rescue and Master Diver, plus specialties such as Nitrox, Deep, Wreck, photography and videography.

Further options cover technical diving, Divemaster and instructor training, and a set of marine conservation courses and internships. It was rated 5.0 from about 5,800 Google reviews in November 2026.