Roberto Rinaldi / Weedy seadragon (Phylloperyx taeniolatus) with diver watching nearby, Australia. Model released

Alex Mustard / Circular fisheye photograph of a colourful coral reef with silhouetted diver, East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea. Model released

Alex Mustard / Diver blowing bubble rings, while resting on the sand, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea, January 2011.

Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Alex Mustard / Diver swimming through dense school of Silversides (Atherinidae) inside a coral cavern, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea. Model released

Todd Mintz / Iceberg dive, diver next to ice floe, Pond Inlet, Baffin Island, Nunavut, Canada, June

Nuno Sa / Blue Shark (Prionace glauca) near sea surface and divers in background. Santa Maria, Azores, September.

Alex Mustard / 2020VISION / Scuba diver swimming in peat stained waters of River Orchy, Highlands, Scotland, UK. Model released.

Alex Mustard / 2020VISION / Scuba diver exploring a sea cave beneath Giants Legs, Bressay, Shetland Islands, Scotland, UK

Juergen Freund / Shovelnose ray (Rhinobatidae) on the sandy bottom with a diver. Tigabu Island, Malaysia, June 2009. Model released.

Juergen Freund / Massive barrel sponge (Xestospongia testudinaria) and diver. Tubbataha Reef National Marine Park, Palawan, Philippines, April 2009. Model released.

Juergen Freund / Tingo Leve of WWF Solomon Islands' Melanesia Programme carrying out an annual reef check survey of Tetepare Island reefs, Solomon Islands, July 2010

Juergen Freund / Soft coral (Alcyonacea) in the shallow mangroves with diver, split level. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station with diver swimming behind it. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Light streaming into a shallow cave in a dive site called The Passage, with a diver swimming up towards the foliage visible above. North Raja Ampat, West Papua, Indonesia, February 2010. Model release...

Juergen Freund / Diver watching a swimming Dugong (Dugong dugon). Dimakya Island, Palawan, Philippines, April 2010.

Juergen Freund / Cyanide fisherman applying cyanide to coral crevices to stun fish. This is highly damaging fishing practice to catch live reef fish either for the aquarium or food fish trade. Palawan, Philippines, Ap...

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station with diver looking up at it. North Raja Ampat, West Papua, Indonesia, February 2010

Jeff Rotman / Boy (nine years) catching 15lb Northern lobster (Homarus americanus) whilst diving in the Atlantic Ocean, Gloucester, Massachusetts, USA Model released Model released.

Alex Mustard / A captive Zebra shark (Stegostoma fasciatum / varium) portrait, with diver behind, in Brighton Sealife Centre, Brighton, England, UK. Model released, not property released

Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008. Model released

Michele Westmorland / Split level view of scuba diver with PR Aquanauts boat in Grenada, Caribbean. May 2009. Property released and diver model released.

Jeff Rotman / Sandblasters searching and blowing a magnetic hit during the recovery of the shipwreck "Las Maravillas", a Spanish galleon sunk in 1658, Bahamas. 1987, Model released Model released.

Jeff Rotman / Lifting a cannon during the recovery of the shipwreck "Las Maravillas", a Spanish galleon sunk in 1658, Bahamas. 1987. Model released Model released.

Jurgen Freund / Jo Browne and Kade Mills use a cylinder cone shaped plankton net to sample gelatinous zooplankton for Coral Reef census, Lizard Island, Queensland, Australia, April 2008. Not released

Jeff Rotman / Diver holds 20 kilo Northern / American Lobster (Homarus americanus) with claws open, demonstrating aggressive behavior, New England, USA, North Atlantic Ocean. Model released Model released.

Mark Brownlow / Rebreather instructor Ian Thomas and cameraman Didier Noirot prepare to dive under the ice, Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia. BBC Plane...

Flip Nicklin / Whale Shark (Rhincodon typus) surrounded by several scuba divers, threatened, Cocos Island, Costa Rica

Flip Nicklin / Two scuba divers swimming through sea cave with schooling Grunts, Cocos Island, Costa Rica

Norbert Wu / Scuba diver exploring ice caves below Weddell Seal (Leptonychotes weddellii) breathing holes, life below feeds on seal feces, Antarctica

Norbert Wu / Scuba diver and salp chain showing asexual reproduction of salps, southern California

Norbert Wu / Scuba diver among colorful corals

Norbert Wu / Medusa (Desmonema glaciale) near the surface, bell can reach over one meter in diameter, Antarctica

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) filmed by diver Chuck Nicklin, Maui

Norbert Wu / Weddell Seal (Leptonychotes weddellii) breathing hole is above this ice cave with diver, the cave is filled with Sea Stars (Odontaster validus) that feeds on seal feces, Antarctica

Fred Bavendam / Diver exploring the Liberty shipwreck, Bali's most popular dive site, Tulamben, Bali, Indonesia

Juergen Freund / Whale shark, diver and air bubbles {Rhincodon typus} Christmas Island, Australia

Michele Westmorland / Blacksaddle grouper (Epinephelus howlandi) with scuba divers in background, Palau, Micronesia.

Michele Westmorland / Scuba Diver at the entrance of Siaes Tunnel with overhanging Gorgonian sea fan, Palau, Micronesia 2010 model released

Michele Westmorland / Scuba Diver at the entrance of Siaes Tunnel with overhanging Gorgonian sea fan, Palau, Micronesia 2010 model released

Michele Westmorland / Scuba diver at Big Drop Off dive site, Palau, Micronesia 2010, model released

Michele Westmorland / Scuba diver wreck diving in Iro Maru WWII Wreck, now home to established coral reef, Palau, Micronesia 2010, model released

Jeff Rotman / Technical Diver in dry suit exploring Emerald Sea. Vancouver Island, British Columbia, Canada, Pacific Ocean

Jeff Rotman / Diver exploring Bridge on Saskatchewan shipwreck, an artificial reef covered with Giant Plumose Anemone (Metridium farcimen), Vancouver Island, British Columbia, Canada, Pacific Ocean Model released.

Jeff Rotman / Diver exploring Bridge on Saskatchewan shipwreck, an artificial reef covered with Giant Plumose Anemone (Metridium farcimen), Vancouver Island, British Columbia, Canada, Pacific Ocean Model released.

Richard Herrmann / Blue Shark (Prionace glauca) female with diver, Nine Mile Bank, San Diego, California

Jeff Rotman / Manta Ray (Manta birostris) caught in gill net, with diver observing the carcass, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Model released. May 2008. Model released.

Jeff Rotman / Common reef octopus (Octopus cyanea) with diver observing, Eilat, Israel, Red Sea. Model released. January 2011 Model released.

Jeff Rotman / Common Thresher Shark (Alopias vulpinus) silhouette of one caught in gill net with diver approaching, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Model released. May 2008. Model released.

Georgette Douwma / Blueline snappers (Lutjanus kasmira) school with an underwater photographer taking a picture. Maldives, Indian Ocean, 2012

Roberto Rinaldi / Weedy seadragon (Phylloperyx taeniolatus) with driver watching nearby, Australia. Model released

Hiroya Minakuchi / Diver examines underwater surface of iceberg, Antarctic Peninsula, Antarctica

Sergey Gorshkov / Brown Bear (Ursus arctos)eyeing photographer Sergey Gorshkov, Kamchatka, Russia

Alex Mustard / Diver approaching the wreck of the bow of the USS Kittiwake (US Military submarine rescue vessel) Photograph was taken shortly after the wreck was deliberately sunk as an attraction for scuba divers,...

Alex Mustard / Southern stingray (Hypanus americanus) swimming over sand by the stern of the USS Kittiwake (US Military submarine rescue vessel) with diver in background. Photograph was taken shortly after the wreck...

Alex Mustard / Diver seen through a porthole of the USS Kittiwake (US Military submarine rescue vessel) Photograph was taken shortly after the wreck was deliberately sunk as an attraction for scuba divers, Caribbea...

Alex Mustard / Divers on scooters exploring the wreck of the USS Kittiwake (US Military submarine rescue vessel) Photograph was taken shortly after the wreck was deliberately sunk as an attraction for scuba divers,...

Norbert Wu / Brown Algae (Cystosphaera jacquinotii) kelp forest and scuba diver, Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Sea Star (Perknaster aurorae) on Brown Algae (Himantothallus grandifolius) and scuba diver, Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Sponge (Mycale acerata) and kelp forest, Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Antarctic Sun Starfish (Labidiaster annulatus), Hydrozoan (Candelabrum penola), and Sponge (Mycale acerata) below kelp forest, Palmer Station, Antarctic Peninsula, Antarctica

Benoit Stichelbaut / Scuba diver entering water backwards from Honda Marine semi-rigid inflatable boat, 2004

Alex Mustard / Horse eye trevally / jacks (Caranx latus) school with a diver swimming beside the bow of the USS Kittiwake wreck, image was taken shortly after the wreck was deliberately sunk as an attraction for scu...

Todd Mintz / Gurney's Sea pen (Ptilosarcus gurneyi) diver in background, Hussar Island, British Columbia, Canada, August

Todd Mintz / Iceberg dive, diver next to ice floe, Pond Inlet, Baffin Island, Nunavut, Canada, June

Todd Mintz / Iceberg dive, diver next to ice floe, Pond Inlet, Baffin Island, Nunavut, Canada, June

Michele Westmorland / Scuba diver with Nurse shark (Ginglymostoma cirratum) in healthy marine life area 'Grand Canyon'. Grenada, West-Indies, Caribbean, May 2009. Model relased.

Michele Westmorland / Scuba diver exploring wreck of small yacht sunk in a hurricane. Grenada, West-Indies, Caribbean. Model released.

Georgette Douwma / Male scuba diver with Gorgonian (Gorganacae) and Sweepers on coral reef. Komodo National Park, Indonesia.

Georgette Douwma / Scuba diver watching a large school of mixed Anthias over acropora corals. Komodo National Park, Indonesia.

Georgette Douwma / Male scuba diver and Table Coral (Acropora hyacinthus) overgrown with soft corals. Komodo National Park, Indonesia.

Georgette Douwma / Male scuba diver watching a school of Sweepers (Pempheris sp.) on coral reef. Komodo National Park, Indonesia.

Georgette Douwma / Scuba diver watching a school of mixed Anthias fish over acropora corals. Komodo National Park, Indonesia.

Doug Perrine / Researcher Guy Stevens photographs belly spot identification pattern of Reef manta ray (Manta alfredi formerly Manta birostris) at cleaning station on coral reef, Manta Point, Lankan, North Male Atoll...

Doug Perrine / Diver photographing Reef manta rays (Manta alfredi formerly Manta birostris) at reef cleaning station with cleaner wrasse at mouth of Hanifaru Bay, Hanifaru Lagoon, Baa Atoll, Maldives, Indian Ocean,...

Doug Perrine / Reef manta rays (Manta alfredi formerly Manta birostris) filter feeding on plankton, with snorkelers and scuba divers in background, Hanifaru Bay, Hanifaru Lagoon, Baa Atoll, Maldives, Indian Ocean, O...

Juergen Freund / WWF Philippines Donsol Research Coordinator taking a photo of the left pectoral fin of a passing Whale shark (Rhincodon typus) for photo identification, to be submitted to www.whaleshark.org. Donsol,...

Pete Oxford / Silky Shark (Carcharhinus falciformis) group and diver, Jardines de la Reina National Park, Cuba

Juergen Freund / Diver navigating a swim-through at dive site called Boo with corals and feather star in the foreground. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Schooling Yellow ribbon sweetlips (Plectorhinchus polytaenia) surrounded by glassy sweepers with a diver in the background. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan corals (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish, with a distant diver in the background. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Colourful Soft corals (Alcyonacea) with diver swimming in the background. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Schooling Yellow ribbon sweetlips (Plectorhinchus polytaenia) with diver watching in the background. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Coral reef with a big boulder coral (Porites sp.) and diver. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Elephant ear sponge (Ianthella basta) in the reef with a diver swimming behind. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Diver looking at Soft corals (Alceonacea) and reef fish in the reef. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Scuba-diving man feeding a Hawksbill turtle (Eretmochelys imbricata) with a sponge. Banda Neira, Moluccas, Indonesia, December 2009.

Juergen Freund / Elephant ear sponge (Ianthella basta) in the reef with a diver swimming behind. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Longfin batfish / spadefish (Platax teira) and diver. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Scuba-diving woman feeding a Hawksbill turtle (Eretmochelys imbricata) with a sponge. Banda Neira, Moluccas, Indonesia, December 2009.

Juergen Freund / Split-level shot of a diver in the shallows by the bungalows of Misool Eco Resort. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Light streaming into a shallow cave in dive site called The Passage, with a snorkeler swimming down into the entrance. North Raja Ampat, West Papua, Indonesia, February 2010.

Juergen Freund / Reef rehabilitation. Divers attach wire mesh to this dynamited area so new coral spawn have a substrate to attach onto and grow from. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Diver looking at schooling striped catfish (Plotosus lineatus) feeding on the sandy sea bed. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Light streaming into a shallow cave in a dive site called The Passage, with a diver swimming through. North Raja Ampat, West Papua, Indonesia, February 2010.