Monad Shoal, a seamount off Malapascua Island north of Cebu in the Philippines, is world-famous as a cleaning station where thresher sharks show up almost daily at depths of about 18β30m. To see them, boats depart around 5am, before sunrise, for an early-morning dive. Sightings aren't guaranteed, but this is considered one of the highest-probability thresher shark viewing sites in the world.