North Twin Pinnacle is scuba diving at boulders covered in the best soft and hard corals ever seen.

To the south west of the island starting at 5m below the surface, North Twin Pinnacle drops down to 35m. Large boulders are covered with purple soft coral and encrusting sponges. Long spiny sea urchins and a few anemones cling to the rocks as do gorgonian sea fans, sea whips and feather stars. Seahorses and ornate ghost pipefish can be found in the sea fans. Emperor angelfish, bicolor parrotfish, grouper and wrasse swim around the rocks. Solitary clown triggerfish can be seen as can titan trigger fish and harlequin sweetlips. Moorish idols and the similar looking schooling bannerfish are also present. Lionfish and bearded scorpionfish are abundant. In shallower areas octopus and cuttlefish are common as are fimbriated moray eels and white-eyed morays.