Koh Tao, island in Thailand located near the eastern shore of the Gulf of Thailand, is well know for scuba diving and snorkeling. Chalok Baan Khao bay, to the south of the island, receives every year more tourists looking for a first dive as well as some more experienced, PADI certified divers. PADI (Professional Association of Diving Instructors) organizes trainings since 1966 and nowodays, almost everybody in good health can dive. But what might look obvious and natural does actually require a minimum of technical knowledge and experience. In 3 to 4 days, PADI instructors prepare the student with a series of courses, mix of theory and dive. This photostory is about the first dive, in a swimming pool, of 7 "PADI Open Water" students.