This dive site situated south of Layang Layang Island via a quick 5 min boat ride is an incredible sloping reef dive full of dense and colourful table, staghorn, plate, brain and mushroom corals, and depths ranging from 5m to 40m. Beginner and expert divers alike can find lobsters, moray eels, hermit crabs and molluscs nestling inside and around the vertical stacks, cubbyholes and valleys of the coral colonies or tunnels, which give this site its name, and the best months to dive here are between February and October.

A profusion of reef fish from anthias to travellers can be seen around the reef tops, including parrotfish, scorpionfish, turkeyfish, boxfish and pufferfish. As the slope drops off at 10m to a vertical wall covered in sponges and soft corals, you could find yourself right in the midst of hundreds of amberjacks swimming in massive barrel formations!

With brilliant viz ranges of 20 to 50m, this site is also a fabulous night divers dream as you discover and see not just the larger pelagic fish like manta rays and reef sharks swimming in on gentle currents, but you can explore the rarely-seen night time activities of critters such as sea urchins, crayfish, starfish, sea lilies and mantis shrimp amongst the sloping reef corals.