SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a horse mussel bed (Modiolus modiolus) Shetland, Scotland, UK, August.

Claudio Contreras / American crocodile (Crocodylus acutus) rear view of animal swimming away over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) split level with animal resting at surface in shallow water over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Cheryl-Samantha Owen / Recreational fishing in a sea kayak for West coast rock lobster (Jasus lalandii). Hoop net or trap is lowered onto the sea floor or kelp bed with a pouch of bait (sardines or pilchards) attached. Kom...

Jeff Rotman / Northern Sea Stars (Asterias vulgaris) feeds on bed of mussels. Cathedral Rocks, Gloucester, Massachusetts, New England USA - North Atlantic Ocean.

Claudio Contreras / Green Seaturtle (Chelonia mydas) in profile above sandy shallow sea bed. Endangered, Cancun National Park, Caribbean Sea, Mexico.

Laurie Campbell / Common / Harbour Seal (Phoca vitulina) bottling / sleeping upright in water and moored in bed of sea thong weed, Islay, Scotland, April

Linda Pitkin / 2020VISION / Dahlia anemone (Urticina felina / Tealia felina), on bed of Common brittlestars (Ophiothrix fragilis), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, August 2011

Linda Pitkin / 2020VISION / Black brittlestar (Ophiocomina nigra), yellow colour variety, with Common brittlestars (Ophiothrix fragilis), on sea bed, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotlan...

Juergen Freund / Dusky garden eels (Heteroconger enigmaticus) feeding on sandy seabed, Indonesia.

Juergen Freund / Sea pens (Virgularia sp) on sandy seabed, Palawan, Philippines.

Juergen Freund / Snowflake moray eel (Echidna nebulosa) hunting over sea rubble, West Papua, Indonesia.

Juergen Freund / Dugong (Dugong dugon) in the seagrass bed shadowed by a trevally. Dimakya Island, Palawan, Philippines

Juergen Freund / Wonderpus (Wonderpus photogenicus) swimming well above the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Umbrella and other human waste thrown out into the coastal waters, settling on the ground becoming marine life habitat, Moluccas Islands, Indonesia, December 2009

Juergen Freund / Dugong (Dugong dugon) feeding in the seagrass bed with trevally fish inspecting the disturbed sand. Dimakya Island, Palawan, Philippines

Juergen Freund / Estuary / Spotted / Common seahorse (Hippocampus kuda) in the rubble. Lembeh Strait, Sulawesi, Indonesia

Billy Black / Starfish in half Oyster (Lophia folium) shell lying on bed of seaweed. Pumpkin Island, Maine, USA.

Georgette Douwma / Soft coral (Dendronephthya mucronata) on sandy seabed. Komodo National Park, Indonesia

Georgette Douwma / Purple sea pen (Virgularia gustaviana) on sandy sea bed. Rinca, Indonesia

Georgette Douwma / Tree coral (Dendronephthya sp) on sandy sea bed. Rinca, Komodo National Park, Indonesia

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.

Onne van der Wal / Young man snorkeling with a Green turtle (Chelonia mydas) in the Grenadines, Caribbean, February 2010. Model Released.

Onne van der Wal / Young man snorkeling over seagrass bed, holding a starfish, The Grenadines, Caribbean. February 2010, Model released.

Georgette Douwma / False fire urchin (Astropyga radiata) grouped on sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Wonderpus (Wunderpus photogenicus) octopus on sea bed, Lembeh Strait, North Sulawesi, Indonesia.

Michael Pitts / Wreck of tugboat ''Blue Plunder'', Nassau, Bahamas. One year after sinking. July 2008.

Michael Pitts / Wreck of tugboat ''Blue Plunder'' at night off Nassau, Bahamas. January 2008.

Juergen Freund / Crab eyed goby (Signigobius biocellatus) Indo-pacific

Juergen Freund / Saltwater crocodile (Crocodylus porosus) swimming underwater, New Guinea, Indo-pacific

Juergen Freund / Saltwater crocodile (Crocodylus porosus) swimming underwater, New Guinea, Indo-pacific

Juergen Freund / Saltwater crocodile (Crocodylus porosus) swimming at water surface, split-level, New Guinea, Indo-pacific

Jose B. Ruiz / Neptune grass bed {Posidonia oceanica} Mediterranean.

Gerry Ellis / Sea Otter (Enhydra lutris) floating in kelp bed, northern Pacific Ocean

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

Michael Pitts / Horse conch on sea bed, Florida, USA

Alex Mustard / Bue ring octopus (Hapalochlaena lunulata) walking across the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Alex Mustard / Blue ring octopus (Hapalochlaena lunulata) walks across the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Alex Mustard / Large blue ring octopus (Hapalochlaena lunulata) swimming just above the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Georgette Douwma / Kaleidoscopic image of Striped catfish (Plotosus lineatus) school feeding on sea bed. West Papua, Indonesia.

Shane Gross / A Banded sea krait (Laticauda colubrina) searches a seagrass bed for food, off North Sulawesi, Indonesia.

Shane Gross / Sea anemone in the middle of a vast seagrass bed attracts a hub of sealife. North Sulawesi, Indonesia.

Shane Gross / A Banded sea krait (Laticauda colubrina) searches a seagrass bed for food, off North Sulawesi, Indonesia.

Georgette Douwma / Plastic tube on sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Discarded ghost nets from fishing boats on the sea bed, choking coral reefs, Sulawesi, Indonesia. November 2018.

SCOTLAND: The Big Picture / Yellow sun star (Solaster endeca) amongst Brittle stars (Ophiothrix fragilis) on a Horse mussel bed (Modiolus modiolus) Sheltand Islands, Scotland, UK, September.

SCOTLAND: The Big Picture / Horse mussel bed (Modiolus modiolus) with Brittle stars (Ophiothrix fragilis),Edible crab (Cancer pagurus) and Northern sea urchin (Strongylocentrotus droebachiensis) Sheltand Islands, Scotland, UK, S...

SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a mearl bed, with Lightbulb tunicates (Clavelina lepadiformis) Shetland, Scotland, UK, August.

SCOTLAND: The Big Picture / Seagrass (Zostera marina) bed, Scotland, UK, May.

SCOTLAND: The Big Picture / Seagrass (Aplysia punctata) bed with a sea hare, Scotland, UK, May.

Steven David Miller / Australian sea lion (Neophoca cinerea) female crawling through bed of seaweed on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking whilst sitting in bed of seaweed. Seal Bay Conservation Park, Kangaroo Island, South Australia.

David Fleetham / Florida manatee (Trichechus manatus latirostris), four resting on sandy river bed. Split level image. Three Sisters Spring, Crystal River, Florida, USA.

David Fleetham / Florida manatee (Trichechus manatus latirostris), mother and calf on sandy river bed amongst fish. Three Sisters Spring, Crystal River, Florida, USA.

Franco Banfi / American crocodile over seagrass bed surfacing, (Crocodylus acutus), Chinchorro Banks (Biosphere Reserve), Quintana Roo, Mexico

Franco Banfi / American crocodile over seagrass bed (Crocodylus acutus), Chinchorro Banks (Biosphere Reserve), Quintana Roo, Mexico

Franco Banfi / American crocodile over seagrass bed (Crocodylus acutus), Chinchorro Banks (Biosphere Reserve), Quintana Roo, Mexico

Pal Hermansen / Angermanalven river with reedbed at edge. Near High Coast Bridge / Hogakustenbron, Veda. High Coast World Heritage Site, Vasternorrland, Sweden. August, 2018.

Ashley Cooper / Sign at 100 feet below sea level in Death Valley. Death Valley is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any r...

Ashley Cooper / Sea Kayaking off Port Isaac in Cornwall UK. April 2007

Ashley Cooper / Floating house bed and breakfast with solar panels, Amsterdam, Netherlands, April 2013.

Ashley Cooper / Sacks of Scallops landed on Ullapool harbour, Scotland, UK, September.

Georgette Douwma / Soft coral (Dendronephthya sp.) growing on sea bed. West Papua, Indonesia.

David Fleetham / Green Sea Turtle (Chelonia mydas) above sea bed with diver in background. Model released.

David Fleetham / Giant Grouper (Epinephelus lanceolatus) on sea-bed, a rare visitor to Hawaii.

David Fleetham / Cameraman filming Lemon sharks (Negaprion brevirostris) attracted by bait, West End, Grand Bahamas, Caribbean.

David Fleetham / Sharksucker (Echeneis naucrates) cleaning scraps from inside mouth of Lemon shark (Negaprion brevirostris), unusual evidence of shark benefiting from relationship. West End, Grand Bahamas, Caribbean.

David Fleetham / Crocodile snake eel (Brachysomophis crocodilinus), awaiting prey. Hawaii.

David Fleetham / Randall's puffer (Torquigener randalli) buried in sand with only eyes visible, Hawaii.

David Fleetham / Oriental flying gunard (Dactylopterus orientalis) with enormous pectoral fins. Hawaii.

David Fleetham / Randall's pufferish (Torquigener randalli), found only in Hawaii and named after Dr. John E. Randall, who has discovered and named more species of fish than any other living person. Hawaii.

David Fleetham / Oriental flying gunard (Dactylopterus orientalis) with enormous pectoral fins. Hawaii.

David Fleetham / Short armed sand octopus (Amphioctopus arenicola) lives in a small hole on sandy seabed, endemic, Maui, Hawaii.

David Fleetham / Shortnose batfish (Ogcocephalus nasutus) resting on seabed, Florida, USA.

David Fleetham / Shortnose batfish (Ogcocephalus nasutus) resting on seabed, Florida, USA.

David Fleetham / Polka-Dot / Spotted batfish (Ogcocephalus radiatus) resting on seabed. Florida, USA.

David Fleetham / Leopard sea robin (Prionotus scitulus) 'walking' along seabed, Florida, USA.

David Fleetham / Green turtle (Chelonia mydas) on corals. Hawaii.

David Fleetham / Green turtles (Chelonia mydas) on seabed, Hawaii.

David Fleetham / Polka-Dot Batfish (Ogcocephalus radiatus), Florida, USA.

Linda Pitkin / Peacock flounder (Bothus lunatus), camouflaged on sandy sea bed Bonaire, Leeward Antilles, Caribbean.

Alex Mustard / Variable jawfish (Opistognathus variabilis) emerging from its hole in the sea bed, close to a coral reef. Ambon Bay, Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocean.

Georgette Douwma / Veined or Coconut octopus (Amphioctopus marginatus) with rubbish collected on the sea bed, for use as house. Ambon, Indonesia.

Franco Banfi / Flamboyant cuttlefish, (Metasepia pfefferi) on sea bed, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Arne Hodalic / Scuba diver removing plastic marine litter from the sea bed. Mljet National Park, Mljet Island, Croatia. May 2015. Model released.

Arne Hodalic / Scuba diver removing plastic marine litter from the sea bed. Mljet National Park, Mljet Island, Croatia. May 2015. Model released.

Arne Hodalic / Scuba diver removing plastic marine litter from the sea bed. Mljet National Park, Mljet Island, Croatia. May 2015. Model released.

Arne Hodalic / Scuba diver removing plastic marine litter from the sea bed. Mljet National Park, Mljet Island, Croatia. May 2015.

Arne Hodalic / Scuba diver removing plastic marine litter from the sea bed. Mljet National Park, Mljet Island, Croatia. May 2015.

Alex Mustard / Christmas tree worm (Spirobranchus giganteus) growing out from a coral, next to a bed of algae. East Of Eden, Similan Islands, Thailand. Andaman Sea, Indian Ocean.

Tony Wu / Australian sea lion (Neophoca cinerea) lying in a bed of sea grass, blowing bubbles. Carnac Island, Western Australia.

Linda Pitkin / Striped catfish (Plotosus lineatus), juveniles foraging for food on the sea bed in a school. Lembeh Strait, North Sulawesi, Indonesia.

Linda Pitkin / Ocellated flounder / Twin-spot flounder (Pseudorhombus dupliciocellatus), camouflaged on sea bed Lembeh Strait, North Sulawesi, Indonesia, February 2016

Inaki Relanzon / Neptune grass bed {Posidonia oceanica} Mediterranean Sea.

Inaki Relanzon / Neptune grass bed (Posidonia oceanica), Mediterranean Sea.