Half Moon Bay Wall is a semicircular wall that begins at 20 feet as a gradually declining slope. At depth of 60 feet, the slope levels off for s short distance than drops to over 100 feet in a semi-circular wall. Hard corals, sea fans, sponges, and soft corals are found on the upper sections. The drop off has large orange elephant ear sponges, azure vase sponges, and soft corals. This area was once above water and it shows the evidence of prehistoric above water times.