To get to this divesite, follow San Vitores Road (the main road in Tumon) as far north as you can, past the Westin and Nikko Hotels, and then go down the road to the beach. The best way to enter this dive from the beach is simply to follow the cables which cut through the reef directly in front of the parking area. The cables can be followed to the cut in the reef where it drops to about 15 feet, sloping down to 130+ feet.
Head either right or left of the cables, as both ways offer large coral heads and abundant marine life. There is a small cave to the left of the cables at about 15 feet. To the right there are also several large holes which hold a variety of fish.
CAUTION: Like every other reef having a western exposure, watch the wave heights carefully before you go in and at the end f the dive. The cable area can turn into a rip currentin moderate to heavy swells.
This is a good night dive, with cracks and crevices hiding many nocturnal creatures.
Tridacna Clams live embedded in coral mounds or lay on the reef. They range in size from very small, to some species that can weight over 500 lbs. They are filter feeders which help keep the oceans clean. The clams mantle tissues act as a habitat for a symbiotic single-celled algae (zooxanthellae) from which it gets nutrition. By day, the clam opens its shell and extends its mantle tissue so that the algae receive the sunlight they need to photosynthesize. They also have two valves that ingest and exhale water, and on the larger ones you can clearly see them.
The small black dots on the mantle are sensors which allow them to detect predators approaching and close their shells for protection.
An entire industry has developed in recent years to grow these clams for the aquarium trade. There are hatcheries in Kosrae and Palau.