Alex Mustard / 2020VISION / Grey seal (Halichoerus grypus) portrait underwater, Farne Islands, Northumberland, England, UK, August

Alex Mustard / School of Bohar snappers (Lutjanus bohar) above a coral reef. These fish are usually solitary but have gathered in the summer in the Red Sea for spawning. Shark Reef, Ras Mohammed Marine Park, Sinai,...

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) school, under a coral ledge, Snapper Hole, East End, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Portrait of Whale shark (Rhincodon typus) at the surface. Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico. Caribbean Sea.

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) portrait, South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Alex Mustard / Harlequin swimming crab (Lissocarcinus laevis) sheltering beneath the tentacles of a tube anemone (Cerianthus sp.). Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Caribbean reef shark (Carcharhinus perezi) bursts through the middle of a school of Yellowtail snappers (Ocyurus chrysurus). Grand Bahama, Bahamas. Tropical West Atlantic Ocean.

Alex Mustard / Fangtooth moray eel (Enchelycore anatina) with mouth open, Grand Canaria, Canary Islands, Spain. East Atlantic Ocean.

Alex Mustard / Secretary blenny (Acanthemblemari maria) yawns as it peers out from a hole in the reef. West Bay, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Nassau grouper (Epinephelus striatus) yawning on a coral reef drop off. San Salvador island, Bahamas. Bahamas Sea, Tropical West Atlantic Ocean.

Alex Mustard / Leafy seadragon (Phycodurus eques). Wool Bay Jetty, Edithburgh, Yorke Peninsula, South Australia.

Alex Mustard / Spotlight goby (Gobiosoma louisae) looking out from inside a Yellow tube sponge (Aplysina fistularis), growing on a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands, British West Indies. Car...