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Green Rock
At this point it is worth mentioning that Green-Rock, Red-Rock and White-Rock were named by the pioneering Italian diver who first discovered them way back in the mid 80's, when Koh Tao was barely inhabited! They were therefore named from the colours of the Italian flag. Giant tumbling boulders create this dive site between 28 and 10 metres deep. Green Rock is a maze of swim-throughs, canyons, caverns and caves. If you take a torch you can see the daisy corals blooming by daytime. Stingrays munch in the corners, nudibranches meander amongst the ceiling sponges and oysters proudly display their mantles. Outside and at the deeper end of the site giant trevalies, cobias, and solitary great barracudas patrol the sea. You may also see white-tip reef sharks, and Jenkins whiptail rays.
If you swim over 'The Minefield' as it's affectionatley known, there are 'Yellow Margin' and 'Titan' triggerfish nesting in hollows in the sand - but keep an eye out for protective parents who can be up to 1 meter in length and guard their crater nests! They're fine if you don't swim over them, as their territory extends upwards, conically, if you swim gently down and away and they won't try and chase you off. The main body of the site will give you the opportunity to enjoy the challenges to your buoyancy skills provided by the many swim-throughs. As you meander through the twists and turns you should see white-eyed morays and green and hawksbill turtles. Some of the island's most spectacular nudibranchs are also found here, along with flatworms and reef squid.
Facts at a Glance:
| Max. Depth | Avg. Depth | Avg. Visibility | From Mae Haad | Diver Skill |
| 28 metres | 16 metres | 10 - 30 metres | 3000 metres | Open Water + |
