Solvin Zankl / Baby Olive Ridley sea turtle (Lepidochelys olivacea) struggles against the swell to swim away from the beach where it hatched, Ostional, Costa Rica. October. Winner of the Underwater category of the G...

Michele Westmorland / Snorkeler swimming with harmless Jellyfish (Mastigias papua etpisonii), Jellyfish Lake, Rock Islands, Palau, Micronesia.

Linda Pitkin / 2020VISION / Split-level view of the River Leith, showing Water-crowfoot (Ranunculus fluitans subsp. penicillatus) growing underwater, Cumbria, England, UK, September. Did you know? Cumbria is one of the least den...

Michel Roggo / Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration; males surrounding a female. Adams River, British Columbia, Canada, October.

Mark Carwardine / Split-level of tourist in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / California sealions (Zalophus californianus), one in water with other sitting on rock, Baja California, Sea of Cortez (Gulf of California), Mexico

Floris van Breugel / Staghorn corals (Acropora) on the coast of tropical island Ofu, one of the Manu'a islands, American Samoa. 2012.

Floris van Breugel / Turquoise waters of the lagoon along Ofu's National Park beach, American Samoa. January 2012.

Ole Jorgen Liodden / Male Hooker's / New Zealand sea lion (Phocarctos hookeri) in water, Campbell Island, New Zealand, sub Antarctic Islands. November.

Christophe Courteau / Edible crab in tide pool split level {Cancer pagurus} Brittany France

Andy Trowbridge / Split level shot of a fly fisherman (Murray Trowbridge) releasing a large brown trout (Salmo trutta) in a gin clear 'backcountry' river, North Canterbury South Island, New Zealand. January, 2012. Mode...

Graham Eaton / A split level image of a small mountain stream. Cwm Idwal, Snowdonia, Wales, September 2011.

Yukihiro Fukuda / Japanese giant salamander (Andrias japonicus) at the entrance to its nest, raising its head to the surface, Japan, August

Yukihiro Fukuda / Male Japanese giant salamander (Andria japonicus) emerging from a nest hole in order to breathe, Japan, August

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) split level view of group hunting at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) swimming in shallows at sunset, Aldabra Atoll, Seychelles, Indian Ocean

Nick Upton / Split level view of a Beadlet anemone (Actinia equina) attached to a boulder encrusted with Maerl (Lithothamnion glaciale) a red coralline alga, in a large rockpool, Crail, Scotland, UK, July

Linda Pitkin / 2020VISION / Split level view of the River Itchen, with aquatic plants: Blunt-fruited Water-starwort (Callitriche obtusangula). Itchen Stoke Mill is visible on the left. Ovington, Hampshire, England, May.

Alex Mustard / 2020VISION / Children enjoying dipping in rockpools at low tide in Falmouth, Cornwall, England, UK, July, all model released

Alex Mustard / 2020VISION / Kelp forest (Laminaria sp) growing beneath the cliffs of Lundy Island, Devon, UK, Bristol Channel, July

Onne van der Wal / Split level view of 30ft Tiki catamaran "Abaco" aground in the shallows. Exumas, Bahamas, Caribbean. June 2009, property released.

Onne van der Wal / Sailing-boat during the Bahamian Sloop regatta, Georgetown, Exumas, Bahamas. April 2009.

Onne van der Wal / Sailing-boat during the Bahamian Sloop regatta, Georgetown, Exumas, Bahamas. April 2009.

Onne van der Wal / Yacht viewed from underwater, Saint Barths Bucket Super Yacht Regatta, Caribbean, March 2009.

Onne van der Wal / Yacht viewed from underwater, Saint Barths Bucket Super Yacht Regatta, Caribbean, March 2009.

Linda Pitkin / 2020VISION / Split-level view of the River Tweed and Coldstream Bridge, Berwickshire, Scotland, UK, October

Alex Mustard / A split level view of shallow water and clouds in summer, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Laurie Campbell / Brown trout (Salmo trutta) resting on river bed near the Aigas Field Studies Centre, Inverness-shire, Scotland, July

Graham Eaton / A low angle view of a waterfall, from within a mountain stream, Ogwen Cottage, Snowdonia NP, Gwynedd, Wales, UK, February

Graham Eaton / A split-level image of a mountain stream, in autumn, with water droplets on lens, Nant Ffrancon Valley, Snowdonia NP, Gwynedd, Wales, UK, October

Graham Eaton / A split-level view through a small waterfall, Llanberis, Snowdonia NP, Gwynedd, Wales, UK, July

Graham Eaton / Split level shot of Llyn Idwal and Cwm Idwal, showing freshwater habitat with Green lacustrine algae (Chlorophyceae sp.), Snowdonia NP, Gwynedd, Wales, UK, August

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of salmon on river bed, annual spawning run, Adams River, British Columbia, Canada, October

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Todd Mintz / Lemon shark (Negaprion brevirostris) at surface, Bahamas, Caribbean

Ole Jorgen Liodden / Galapagos Sea Lion (Zalophus wolllebaeki) under the surface. Galapagos

Nuno Sa / Blue Shark (Prionace glauca) at the sea surface. Santa Maria, Azores, August.

Nuno Sa / Blue Shark (Prionace glauca) at the sea surface. Santa Maria, Azores, August.

Nuno Sa / Blue Sharks (Prionace glauca) at the sea surface. Santa Maria, Azores, August.

Alex Mustard / 2020VISION / Grey seal (Halichoerus grypus) surfacing beneath cliffs, Lundy Island, Devon, UK, June. Did you know? The grey seal is one of the rarest seals in the world, and the UK holds around 40% of the world po...

Alex Mustard / 2020VISION / Scenic photo of River Coe in the Highlands, Glen Coe, Scotland, UK, April 2011. 2020VISION Book Plate. Did you know? Glen coe is the remains of a supervolcano which erupted 420 million year ago.

Jan Hamrsky / Mosquito (Culex pipiens) adult emerging through water surface from larva. Europe, August.

Mark Carwardine / Grey Whale (Eschrichtius robustus) calf at the water surface being petted by a tourist. San Ignacio Lagoon, Baja California, Mexico, April.

Andrew Parkinson / Mallard (Anas platyrhynchos) line of ducklings follow their mother through early morning mist, Derbyshire, UK, June.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills, Lake Kerkini, Greece, February. Highly Commended, 2011 Wildlife Photographer of the Year competition.

Graham Eaton / Split level image of Cwm Idwal and Llyn Idwal showing lake and mountain habitat and lacustrine algae, Snowdonia NP, North Wales, UK, January 2010. Winner of the Living Landscape: Connectivity categor...

Bryan and Cherry Alexander / Melting iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Tabular iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Bryan and Cherry Alexander / Ice arch iceberg showing the portion underwater that is sculpted by the sea. Polar regions. Digitally created image composite

Juergen Freund / Green turtles (Chelonia mydas) mating over coral reef, Sipadan Island, Sabah, Malaysia, June, Endangered species

Juergen Freund / Schooling Silverside fish (Antherinidae) split level with karst limestone walls, West Papuan fisherman in boat, North Raja Ampat, West Papua, Indonesia, February 2002.

Juergen Freund / Schooling Silverside fish (Antherinidae) split level with karst limestone walls, fan coral and featherstar, North Raja Ampat, West Papua, Indonesia, February 2002.

Juergen Freund / Split level of a small island outcrops with a single tree and coral reefs underwater. Sabah, Malaysia, June 2009.

Juergen Freund / Kite fisherman using a kite and fishing line. Skipjack tuna are a common catch. Sulawesi, Indonesia, November 2009.

Juergen Freund / Kite fisherman using a kite and fishing line. Skipjack tuna are a common catch. Sulawesi, Indonesia, November 2009.

Juergen Freund / Fisherman with a net full of freshly blasted or dynamited schooling fish collected from the reef. Phillipines, April 2009.

Juergen Freund / Split level image of Papuan fisherman standing on his dugout canoe over shallow corals, New Ireland, Papua New Guinea, June 2010

Juergen Freund / Split level image of shallow bleaching corals at sunset, New Ireland, Papua New Guinea

Juergen Freund / Split level of coral reef and island showing bleaching of shallow corals caused by temperature rise, New Ireland, Papua New Guinea June 2010.

Juergen Freund / Split level of solar powered gauge measuring sea temperature, West New Britain, Papua New Guinea, May 2010

Juergen Freund / Split level of dive boat "Seven Seas", coral reef and island, Komodo NP, Indonesia, August 2009.

Juergen Freund / Split level of snorkeler over coral reef on white sandy seabed contrasting with dry topside landscape in background, Komodo NP, Indonesia, August 2009. Model released.

Juergen Freund / Roots of Black mangrove tree (Avicennia germinans) Komodo NP, Indonesia, August 2009.

Juergen Freund / Caretaker transfers live fish in fish pens of Groupers / Coral trout, Live Reef Fish Trade, Tampakan, Kudat Bay, Sabah, Borneo, Malaysia, June 2009.

Juergen Freund / Fisherman on outrigger boat catching Yellowfin tuna with hook and line. Sulawesi, Indonesia, December 2009. Fishermen fish close to a fish attracting device, some remain at sea for up to 2 months.

Juergen Freund / Shallow bleaching corals, split level with the island, Lissenung, New Ireland, Papua New Guinea, June 2010.

Juergen Freund / Split-level shot of coral reef and island with snorkeller swimming underwater. Misool, Raja Ampat, West Papua, Indonesia, January 2010. Model released.

Juergen Freund / Split-level shot of coral reef and island. Misool, Raja Ampat, West Papua, Indonesia, January 2010

Juergen Freund / Soft coral (Alcyonacea) in the shallow mangroves with diver, split level. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Fallen mangrove leaves adding to detritus in the soil. North Raja Ampat, West Papua, Indonesia, February 2010.

Juergen Freund / West Papuan fishermen in their outrigger houseboat over the shallow reef. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Local fishermen capturing a sea turtle for food, Kei islands, Moluccas, Indonesia, November 2009

Juergen Freund / Split-level shot of a shallow coral reef and house on stilts. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010

Juergen Freund / Papuan boy swimming in the shallows with his pet baby hawksbill turtle (Eretmochelys imbricata). Tunnung Island, New Hanover, Papua New Guinea, June 2010

Juergen Freund / Floating fruit of a Cannonball mangrove (Xylocarpus granatum) which when opened has seeds like a natural puzzle. Lembeh Strait, North Sulawesi, Indonesia, September 2009

Juergen Freund / Split-level shot of a pet baby Hawksbill turtle (Eretmochelys imbricata) swimming in the shallows. Tunnung Island, New Hanover, Papua New Guinea, June 2010.

Juergen Freund / Baby green turtle (Chelonia mydas) hatchling in the shallows of the beach, swimming out to sea. Anano Island, Wakatobi, South Sulawesi, Indonesia, November

Juergen Freund / Baby green turtle (Chelonia mydas) hatchling in the shallows of the beach, swimming out to sea. Anano Island, Wakatobi, South Sulawesi, Indonesia, November.

Juergen Freund / Snorkeler swims amongst Sergeant major damselfish (Abudefduf vaigiensis) at the house reef of Miniloc Island Resort, El Nido Island, Palawan, Philippines, May 2009. These fish gather in a dense mass w...

Juergen Freund / Snorkeler swimming underwater, split level, with Miniloc Island Resort in the background, El Nido, Palawan, Philippines, May 2009. Model released

Juergen Freund / Sergeant major damselfish (Abudefduf vaigiensis) at the house reef of Miniloc Island Resort, El Nido Island, Palawan, Philippines, May 2009. These fish gather in a dense mass when bread is thrown into...

Juergen Freund / Diver lowering an artificial reef made of ceramic snowflakes to help rejuvenate the dead reef of El Nido. The 1998 El Nino caused a massive scale coral bleaching to this tourist town that used to have...

Juergen Freund / Split level of shallow bleaching corals and island, New Ireland, Papua New Guinea, June 2010

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) in its floating Sargassum seaweed home, Miniloc island in the background, El Nido, Palawan, Philippines.

Juergen Freund / Outrigger boats catch Yellowfin tuna fishing with hook and line. Catching a Yellowfin tuna, these fishermen fish near a fish attracting device (FAD) or rumpon, attached to a raft or rakit some 100 km...

Juergen Freund / Split-level shot of Leatherback sea turtle (Dermochelys coriacea) baby swimming in the sea near the beach. Warmamedi beach, Bird's Head Peninsula, West Papua, Indonesia, July 2009

Juergen Freund / Split-level shot of Leatherback sea turtle (Dermochelys coriacea) with West Papuan boy in the water. Warmamedi beach, Bird's Head Peninsula, West Papua, Indonesia, July 2009

Juergen Freund / Split-level shot of Green turtle (Chelonia mydas) in the reef shallows, swimming towards the camera. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of mating pair of Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of Fan coral (Gorgonacea) in the shallows with boat shilouetted against the sunset in the background. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Split-level shot of a shallow coral reef and mangroves with local West Papuan man in a dugout canoe. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Split-level shot of old coral reef destroyed by dynamite fishing. New corals are not able to colonise the rubble. Misool, Raja Ampat, West Papua, Indonesia, January 2010