Black Rock is considered one of the premier dive sites in the Mergui Archipelago. It is fairly remote and thus attracts the big fish. The island itself is like a set of steps dropping down to over 70 meters deep. A spectacular wall dive can be made here and sightings of whale sharks have been reported. There are also silvertips, grey reef sharks, possibly manta rays and some huge barracuda lurking in the depths. Corals and anemones are also abundant here so this dive has it all!