Half Moon Wall is incredible. The vertical wall at times cuts back in on itself, displaying many interesting features. Sponges protrude t right angles to the reef, competing for space with gorgonians and sea fans. Mountainous star and giant brain coral are interspersed with smaller clumps of staghorn, brain and lettuce coral. Anchored amongst these are the hydrozoans and tunicates.
The top of the wall is ablaze with fish life: large angelfishes in groups of four or five; every variety of butterflyfish, always in pairs; large squirrel fishes posing outside their holes; and small grouper, impatient to see the world deeper down, looking and behaving in the same way as their much larger parents.
Turtles are common-they lay their eggs on Half Moon Caye-but the real excitement is generated by pelagic. This is the only sheltered dive site on the eastern side of any of the three atoll reefs and divers can expect some really amazing encounters. Oceanic whitetip sharks (complete with their attendant pilotfish), lemon, blacktip and bull sharks are likely to be seen. The very largest of manta rays and good specimens of spotted eagle rays are frequently seen. At the very limit of safe diving are very large jewfish- some so large they might stalk the diver, although they pose no danger. The wall continues down well beyond the safe reach of scuba divers.