A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

Hector's dolphins (Cephalorhynchus hectori) by swimmer. Akaroa, New Zealand.

Thrill seekers experience cage diving with Galapagos sharks, Carcharhinus galapagensis, North shore, Oahu, Hawaii, USA

Snorkeling in Shark Alley and Hol Chan Marine Reserve, Ambergris Cay, Belize

Young woman snorkeling with a school of fish, Water Cay, Utila, Honduras