Scuba diving in Shark Cave

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Access
From Boat
Diver level
Advanced
Depth
Average: 10 m
Maximum: 30 m
Current
Can be strong (>3 knots)
Visibility
Average: 20 m
Maximum: 30 m
Due to the sometimes strong currents in this place, this dive is most suitable for advanced divers. Shark Cave (also known as Three Islets or Cavern Island) is one of the most well-known diving spots in the Mergui Archipelago. This place gained its fame due to the outstanding variety of marine fauna species it shelters. The site consists of three big rocks, the undersea canyon in the middle, and a 20m/66ft-long tunnel toward the end. The bottom of the site is sandy, and the surface of the rocks is covered in corals of various types.

When to go

To enjoy the Shark Caves site, it's best to visit it from November to April, when there is the least rainfall, and the sea temperature averages 27C/81F. June through August is considered to be the worst time to dive because of the practically non-stop rain during this period. During September and October the rainfall is of moderate intensity.

What to see

Flora: corals of whip, orange cup and green tubastrea species, covering the surface of the rocks, anemones.
Fauna: nurse, grey reef sharks, starfish, harlequin ghost pipe fish, fusilliers, harlequin shrimps, snappers.

Reachable from

Koh Chang, Koh Phayam, Ranong, Mergui Archipelago

Liveaboards with trips to Shark Cave

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