6 dive sites in Olongapo, Grande Island, Philippines: 3 reefs, 2 wrecks and 1 other site.
Recorded maximum depths range from 20 m to 32 m (3 of 6 sites have a depth).
By level: 2 beginner and 1 intermediate.
Species confirmed at sites here by diver sightings (three or more independent divers) or by two or more independent sources, with the number of sites each is confirmed at.