Western Rocky

The tunnel is the draw and it is an overhead environment — a torch and good buoyancy matter. Nurse sharks are still reported inside but are not the certainty older trip reports suggest. Currents are variable rather than consistently heavy.

Depth

5–40m

Current

Moderate

Diver level

Advanced open water

Entry

Boat

Unique features

A tunnel running through the main rock, historically holding tawny nurse sharks up to about 3m
One of the southernmost Mergui sites, usually dived early or late in an itinerary
Lobsters, morays, cuttlefish and schooling trevally on the surrounding boulder slopes

Sources & last checked

Checked August 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

Diving in Burma (Myanmar) - Mergui Archipelago — Dive The World
The Mergui Archipelago — The Smiling Seahorse

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.