If you are planning to get Open Water or Advanced Scuba Certificate I recommend you go talk to the awesome instructors at Big Blue Koh Tao. Like most people on the island, overwhelmed with all the choices, I walked around checking out diving schools. I was making a pretty serious choice learning how to scuba dive. I wanted an environment I felt safe and comfortable with. As soon as I walked into Big Blue I knew this would be the place I was going to get certified. I couldn't have asked for a better experience. The staff were amazing, the instructors were knowledgeable and fun and exciting. It was a very friendly environment and I learned so much. My Instructor was Sonia Scott and I knew before I finished my Open Water Course that I wanted to complete my Advanced and I requested for her to be my instructor. I stayed on Koh Tao for 2 weeks getting Advanced Adventurer Certified and I have over 20 dives now. I can not wait to go back to Big Blue. Check it out for yourself!