Sawadee is the deepest dive site that is close to the main island. It is frequently used as a deep dive training site, as a part of the Advanced Open Water course. It is also used for leisure dives as well. Its water has a very good depth with moderate to strong currents but with a slightly poor visibility.
Here are two huge wooden Thai fishing boat wrecks, lying at the sandy bottom of the Tekek Bay. These wrecks are dotted with many soft and hard colorful corals. They also serve as a home for a variety of fish. The marine life here is rich, including large shoals of fusiliers, small box fish, stone fish, small octopus, king fish, moray eels, frogfish, lionfish, and sea horses.