Koh Tao Divers, also known as KTD, is the oldest scuba diving school on Koh Tao, established in 1987. KTD is known for our experienced instructors, relaxed vibe and amazing diving. KTD is Finnish owned and run, but our international team offers courses also in English, Italian and Danish when needed.At KTD you will find the full range of diving courses starting from beginner courses all the way to professional level and technical diving. We’re affiliated with Scuba Schools International and proudly boast the Diamond Instructor Training Resort rating. In technical diving we offer both SSI Extended Range and TDI courses.