Luciano Candisani / Cushioned Star (Oreaster reticulatus), Gipoia Island, Ilha Grande, Brazil

Andy Rouse / Manta ray (Manta birostris) swimming on ocean floor Coral Bay, Australia

Nick Upton / Shoaling young sardines (Sardina pilchardus) swimming in shallow water in a sandy bay, casting shadows on the seafloor, viewed from above water. Eastern Lesbos / Lesvos, Greece, August.

Doug Perrine / Wild sociable Bottlnose dolphin harasses Nurse shark {Tursiops truncatus} Turks and (Non-ex).

Dan Burton / Common brittlestars (Ophiothrix fragilis) on sea bed, Scotland

Jeff Rotman / Diver observing dead sharks on seafloor, finned alive and thrown overboard to drown, caught on longline, Cocos Island, Costa Rica, Pacific Ocean Model released.

Nick Hawkins / A winter flounder (Pseudopleuronectes americanus) camoflages against the seafloor off Nova Scotia, Canada. July.

David Fleetham / Diver on underwater scooter exploring Landing Craft wreck. Green sea turtle (Chelonia mydas) on seafloor. Makena, Maui, Hawaii. March 2012. Model released.

David Fleetham / Starry night octopus (Octopus luteus) on seafloor, Komodo, Indonesia.

David Fleetham / Hermit crab (Dardanus lagopodes) in a white shell on the seafloor. Yap, Micronesia.

Alex Mustard / Snowflake moray eel (Echidna nebulosa) home amongst garbage on the seafloor, including a plastic toothpaste tube. Ambon Bay, Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocea...

Constantinos Petrinos / Caltrop murex (Murex Tribulus) laying their egg masses on muddy seafloor of the Lembeh Lembeh Strait, North Sulawesi, Indonesia.