Diving with Thresher Sharks at Malapascua island, Philippines. This site, Monad Shoal near Malapascua, is a sunken island at 18-24m whose sides drop off to 230m. At this spot Thresher sharks come each morning to be cleaned. Small fish called cleaning wrasse eat dead skin and bacteria from the shark's body. This dive was performed in end Sept 2012. Filmed with GoPro Hero2, and a GoPro flatlens underwater housing.