I Just returned from three weeks in the PI (Anilao and Sabang outside Puerto Galera). Sharks in those sites are essentially non-existent. Never saw one and the guides tell me a sighting is very rare. Anilao is for muck diving... soft substrate that can affect visibility (still fairly good though) with LOTS of critters, mostly macro. Sabang had a mix of coral reefs and some muck. I can't say anything for other sites in the PI as I have yet to visit them but hope to try a few in the future.[/QUOT
If you are looking for sharks in Anilao, I sometimes see sharks at Mainit point or Mapating . These are the only place I know of that you can see sharks. But were you not able to dive at sharks cave in PG. There are definitley sharks in that divesite.