Crab Island has a lovely dive site that is relatively shallow but full of a wide variety of macro marine life. The dive will take you to about 10 meters and can be completed by all level of divers.
The dive site is a great reef in good condition with many different types of marine life. It is a shore dive from the island making it a nice and easy dive to get access to and its visibility is typically good as it can reach up to 30 meters.
The island is uninhabited and lies between the two beaches, Kata and Karon; it is a short boat ride of about 5 minutes to get to the island. The reef is made up of mainly hard coral with some granite boulders making for an unusual topography. The boulders are always worth a second look and investigating them can reveal smaller marine life hidden away such as crabs, or larger pelagic fish taking shelter.
Once in the water, divers can expect to see, many juvenile schools of fish, schools of yellow snapper, fusiliers, turtles and stingrays. For macro photographers, there are many different kinds of nudibranchs, scorpion fish, and frogfish.