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.

Jeff Rotman / Gurney's Sea Pen (Ptilosarcus gurneyi) on sea bed at night, Queen Charlotte Strait, British Columbia, Canada, North Pacific Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in shallow above sandy seabed, Aldabra Atoll, Seychelles, Indian Ocean

Nick Upton / Close up view of 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, Augus...

David Shale / Bathypelagic comb jelly (Ctenophora) from benthic boundary layer. Found attached to seafloor by adhesive tentacles. Mid atlantic ridge, June 2010

David Shale / Bathypelagic comb jelly (Ctenophora) from benthic boundary layer. Found attached to seafloor by adhesive tentacles, Mid atlantic ridge, June 2010

David Shale / Bathypelagic comb jelly (Ctenophora) from benthic boundary layer. Found attached to seafloor by adhesive tentacles. Mid atlantic ridge, June 2010

Alex Mustard / A Whitetip Reef shark (Triaenodon obesus) resting on the seafloor on a coral reef. Unlike other most sharks this species can breath without swimming by panting as it rests. Sipadan Island, Sabah, Born...

GEORGETTE DOUWMA / Titan triggerfish (Balistoides viridescens) investigating bivalve. Lembeh Strait, North Sulawesi, Indonesia.

David Shale / Benthic bristleworm (Polychaete) Gulf of Mexico, Deep sea species

GEORGETTE DOUWMA / Maiden goby {Valenciennea puellaris} resting on seafloor. Egypt, Red Sea. Indo-Pacific.

Norbert Wu / Benthic community on seafloor, diver hanging below sea ice, Antarctica

Norbert Wu / Feather Duster Worm (Perkinsiana sp) in seafloor community, use their feathery gills to fan water for food particles, Antarctica

Constantinos Petrinos / Star puffer on sea bed {Arothron stellatus} Sulawesi Indonesia

Doug Perrine / Atlantic Bottlenose dolphin crater feeding in sand {Tursiops truncatus} Bahamas Caribbean Sea (Non-ex).

Doug Perrine / Atlantic Bottlenose dolphin emerges from sand after crater feeding {Tursiops truncatus} (Non-ex).

Doug Perrine / Dugong with Golden pilot jacks {Dugong dugong} Australia (Non-ex).

Juergen Freund / Sea stars on seafloor {Protoreaster nodosus} Indo Pacific

GEORGETTE DOUWMA / Leopard sea cucumber {Bohadschia argus} Great Barrier Reef, Australia

Constantinos Petrinos / Stargazer fish hidden on seabed {Uranoscopus sulphureus} Sulawesi Indonesia

Constantinos Petrinos / Titan triggerfish hunting {Balistoides viridescens} - stirs up sand by blasting stream of water at seabed to expose prey. Lembeh Strait, North Sulawesi Indonesia

Constantinos Petrinos / Two Harp snails {Harpa major} on seabed, Lembeh Strait Sulawesi Indonesia

Constantinos Petrinos / Slipper lobster {Scyllarides haanii} Sulawesi, Indonesia Indo Pacific

Constantinos Petrinos / Mutilated Swimming crab {Portunidae} & tiny Moray eel, Sulawesi Indonesia. Indo Pacific

Constantinos Petrinos / Radiant sea urchins {Astropyga radiata} stick close together in defence on sea floor Sulawesi Indonesia, providing shelter / mini habitat for fish and crabs

Constantinos Petrinos / Cockatoo righteye flounder on seabed; defensive dorsal fins to scare away would-be predators {Samaris cristatus} Sulawesi Indonesia,

Juergen Freund / Sea anemone feeding {Tealia lofotensis} Canadian Pacific. Tentacles out. Sequence

Constantinos Petrinos / Anemone Hermit crab {Dardanus pedunculatus} carrying anemone, Sulawesi

Juergen Freund / Anemone {Tealia lofotensis} Canadian Pacific