Spend a day dive in 2 small islands koh bida nok and koh bida nai exploring variety marine life in this beautiful andaman sea letting you enjoy and have close encounters with the turtles bida nok offers fantastic walls and reefs descending down to 91ft 28m deep on its west side this island is a natural habitat for a vast range of corals and marine life on the east side there are shallow reefs and plateaus just 10ft 3m deep where black tips can be regularly seen koh bida nai is a ho