This shot of densely packed jellyfish is about two metres square. Taken in a bay on the island of Ios in Greece.
                       
Large Soft Tree Coral (Dendronephthya rubeola) against the sun, Jessie Beazley Reef, Sulu Sea, Palawan, Philippines.
                       
Pinochio, unicorn fish, Red Sea
                       
Wolfish head on
                       
Shark in midwater with Remora attached, Carcharhinidae, Requiem sharks, Bahamas
                       
Manatee full face
                       
Bottlenose Dolphin swimming