Do you remember when your instructor told you to look for the small things? Twins is the ideal place to take that advice. Two groups of rocks at depths from 10m to 18m. Your divemaster or instructor may show you the haunts of grouper, panda clownfish and stingrays, but if you take your time and look closely you might also see anemone shrimp, morays, flatworms and pipefish, as well as cleaner wrasse at their never-ending work.
Check the crevices for baby angelfish, keep an eye on the water above for squid and crocodile longtom and look for the dancing fins of the juvenile sweet lips.
Widely considered Koh Tao’s premier dive site, Chumphon Pinnacle is also one of the island’s most challenging with occasionally strong currents.Ranging from depths of 12m to 40m, the site is a group of massive rocks arranged in a rough oval and running north to south.
Visibility is superb in season, and the site plays host to a wide variety of pelagics as well as reef fish. Great barracuda, king mackerel, grouper, and tuna throng to Chumphon all year around, and in season whale shark sightings are common. As the site is a fair distance offshore, visitors from the open ocean are unpredictable -sailfish, oceanic white tip sharks and bull sharks have also been spotted.
Fascinating rock formations create small caves and swim throughs at Green Rock, which ranges in depth from 4m to 28m. Brightly colored nudibranchs are omnipresent, as are morays, harlequin sweet lips and blue ringed angelfish. White tip reef sharks can be seen from time to time, and at the deeper end of the site large grouper and schools of yellowtail, fusilier and silverfish can be seen. Look out for “the minefield”, where scores of yellow margin and Titan triggerfish have made their nests in sandy pits.