Teenager with snorkle equipment walking along the beach, Mayan Riviera, Akumal, Yucatan, Quintana Roo, Mexico, North America

A young woman free diving with black triggerfish (Melichthys niger), Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

A young lady free diving off Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

A snorkeler dives on a healthy hard coral reef near Two Tree Island off Kadavu Island in the southeast corner of Fiji, Fiji

Two young women free diving with black triggerfish (Melichthys niger), Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

Slate pencil sea urchins (Heterocentrotus mammillatus) colour the foreground of this Hawaiian reef scene with a young woman free diving with black triggerfish (Melichthys niger), Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

A girl snorkeling over table coral and reef fish off Apo Island, Philippines

Aerial view of Mokuho’oniki Islet and Kanaha Rock near the island of Molokai, Maui County, Hawaii, United States of America

Hawaii, Oahu, Lanikai, Young Japanese woman wearing snorkle gear on the beach.

Hawaii, Oahu, Lanikai, Young Japanese woman wearing snorkle gear in the ocean.