There are three distinctly different types of diving: inside the atolls, outside the atolls and inside the channels or passes, which is where the currents are strongest and you'll find the greatest congregation of fish life. Most intriguing are the cleaning stations, found around every corner and under every ledge. Groupers, snappers, surgeonfish, eels, parrotfish, even giant Napoleon wrasse park casually in corners, oblivious to all, (including cameras) while armies of wrasse, shrimp and other assorted cleaners pick at debris in their open gills and cavernous mouths.