HOUSE REEF.
This meandering reef features different species of tunicates, sponges, seastars, sea cucumbers, turtles and cuttlefish (seasonal). An aggregation of giant clams (Tridacna gigas, an endangered species) is located at 12 meters. Several species of damselfish, wrasses, groupers, fairy basslets, emperors, parrotfish, snappers, butterfly fish, flying gurnard and cardinal fish are among the inhabitants of the reef. Those that burrow in sand include sand perches, lizardfishes, flatfishes, stingrays and certain wrasses. During the day, a large aggregation of jacks can be found in the inner reef slope. Fusiliers, barracudas and tunas roam large areas around the island while a number of reef-associated fishes venture to the open sea.

KYOKUZAN MARU (WRECK).
This Japanese freighter measures about 152 m long and lies almost upright. The main structures remain intact. It carries in one of its holds a car and a truck. This wreck provides shelter to batfishes and substrate for the ubiquitous bivalves. Fusiliers, trevallies, barracudas and rays are occasionally sighted.

APO REEF.
Very dramatic drop-offs down to about 400 m. The steep walls are well covered with corals, sponges, tunicates, nudibranchs and slugs. The coral formation is magnificent at the plateau. Green and hawksbill turtles and multitude of fish including damselfish, butterfly fish, batfish, surgeonfish, snappers, fusiliers and trevallies are usually seen. Strong currents increase the chance of sighting mantas, great barracudas and sharks. This reef is also known as the Apo Reef Natural Park.