Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Church Bay, popular beach for swimming and snorkelling, Southampton Parish, Bermuda

Island of Taha'a, French Polynesia. A tourist girl do dive at the Motu Mahana, Taha'a, Society Islands, French Polynesia, South Pacific.

Portugal algarve near Lagos, Praia do Camilo, Atlantik coast

Portugal algarve near Lagos, Praia Dona Ana Atlantik coast

A woman snorkelling and making the 'okay' sign with her hands, Belize Barrier Reef, Belize

A Boy On The Beach With Snorkelling Gear, Kauai, Hawaii, United States Of America

A Boy On The Beach With Snorkelling Gear, Kauai, Hawaii, United States Of America

A Boy On The Beach With Snorkelling Gear, Kauai, Hawaii, United States Of America

A Couple Walks On A Wooden Dock With Snorkelling Gear, Saint Georges Caye Resort, Belize City, Belize

A Boy Running Out To The Ocean Across The Beach With Snorkelling Gear, Kauai, Hawaii, United States Of America

Two men free diving over a Hawaiian hard coral reef with slate pencil sea urchins (Heterocentrotus mammillatus), Hawaii, United States of America

Two women free diving at Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

Slate pencil sea urchins (Heterocentrotus mammillatus) colour the hard coral in this Hawaiian reef scene with three free divers, Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America

Popular beach busy with tourists on Hanauma Bay, Oahu, Hawaii, United States of America

A young couple free diving in clear water over a Hawaiian reef, Hawaii, United States of America

A young woman with snorkel gear alone on a beach, Cabilao Island, Central Visayas, Philippines

Three young people free diving over a Hawaiian reef, Hawaii, United States of America

Young woman in red bikini snorkels over coral reef, Molokini, Hawaii, United States of America

Snorkelers getting ready to enter the water from a snorkelling tour boat operated out of Maui, Hawaii. They are located next to the backwall of Molokini Crater which is a volcanic tuff cone, Maui, Hawaii, United States of America

People snorkelling at Shark's Cove on the North Shore, Oahu, Hawaii, United States of America