Alex Mustard / Tawny nurse sharks (Nebris ferrungineus) at night. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Midnight snapper (Macolor macularis) shelters in a cavern on a coral reef with white soft corals (Scleronephthya sp.) and solderfish. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / School of White collar butterflyfish (Chaetodon collare) pack together above a coral reef. North Male Atoll, Maldives. Indian Ocean

Alex Mustard / Bengal snapper (Lutjanus bengalensis), Bannerfish (Heniochus diphreutes) and Fusiliers (Caesio sp.) diving towards coral reef to avoid predators. North Ari Atoll, Maldives. Indian Ocean.

Jordi Chias / Woman snorkeller swimming inside lagoon Toau atoll, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) feeding on coral, South Ari Atoll, Maldives Islands, Indian ocean.

Alex Mustard / Wave breaking over the rubble zone close to the reef crest of a coral reef. Baa Atoll, Maldives. Indian Ocean.

Pascal Kobeh / 'Lotus', an artificial reef built in 2001 with a steel frame with a mild electrical current which encourages the growth of coral, Ihuru Island, North Male Atoll, Maldives, Indian Ocean. Small reprodu...

Pascal Kobeh / Giant clam (Tridacna) on 'Lotus' artificial reef, built in 2001 with a steel frame using mild electric currents to encourage coral growth, with diver in the background. Vabbinfaru Island in North Male...

Cheryl-Samantha Owen / Green-backed heron (Butorides striatus) jumping, Aldabra Atoll, Seychelles

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Ingrid Visser / Coral reefs and islands, Kimbe Bay, West New Britain Island, Papua New Guinea

Doug Perrine / Palm tree octocoral {Clavularia sp} Layang layang atoll, Malaysia

Tui De Roy / Palm trees and water flowing on beach on Palmyra Atoll, a wet, equatorial atoll with fringing reefs, native forests and abundant seabirds, Palmyra Atoll National Wildlife Refuge, US Line Islands

Alex Mustard / Large school of Humpback snapper (Lutjanus gibbus) form into a tight ball on a coral reef. North Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Reef manta (Mobula alfredi) visiting a cleaning station on a coral reef with a school of Onespot snappers (Lutjanus monostigma), Oriental sweetlips (Plectorhinchus vittatus) and Sabre squirrelfish (Sa...

Alex Mustard / School of Lowfin chub (lowfin rudderfish: Kyphosus vaigiensis) swimming near the surface beneath a setting sun. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Long exposure portrait of a Tawny nurse shark (Nebris ferrungineus), with Pink whipray (Himantura fai) and Bluefin trevally (Caranx melampygus) at dusk. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Several mimic goatfish (Mulliodichthys mimicus) hide within a school of Bluestripe snapper (Lutjanus kasmira) on a coral reef. North Ari Atoll, Maldives. Indian Ocean

Alex Mustard / Long exposure with zoom blur of a school of crescent-tail bigeye (Priacanthus hamrur) on a coral reef. North Male Atoll, Maldives. Indian Ocean

Alex Mustard / Three moray eels, a Honeycomb moray: (Gymnothorax favagineus), Yellowmargin moray: (Gymnothorax flavimarginatus) and White-eyed moray (Gymnothorax thrysoideus) emerge from a single hole in a coral ree...

Alex Mustard / Hard coral (Porites sp.) micro-atoll. A microatoll is a circular colony of coral, dead on the top from exposure to air at low tide, but living around the edge. Their presence in coral reef fossils is...

David Fleetham / Painted frogfish (Antennarius pictus) with first dorsal spine and lure extended to attract prey. Dumaguete, Philippines.

Alex Mustard / Tawny nurse shark (Nebris ferrungineus) patrols a coral reef at night. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Pair of a Honeycomb moray eels (Gymnothorax favagineus) on a coral reef with triggerfish schooling above. North Male Atoll, Maldives, Indian Ocean.

Ashley Cooper / Ship wrecked by Hurricane Bepe on Funafuti Atoll, Tuvalu. March 2007

Ashley Cooper / American tank left during the second world war on Funafuti Atoll, Tuvalu. March 2007

Ashley Cooper / Tepuka Island, Funafuti atoll, Tuvalu. This area is extremely low lying and vulnerable to climate change.

Ashley Cooper / Man pushing out boat in Funafuti Atoll, Tuvalu. March 2007. This area is low lying and very susceptable to sea level rise.

Ashley Cooper / Man in boat in Funafuti Atoll, Tuvalu. MArch 2007. This area is low lying and very susceptable to sea level rise.

Ashley Cooper / Island in Funafuti Atoll, Tuvalu. March 2013. This area is low lying and very susceptible to sea level rise.

Ashley Cooper / Beach on Funafuti Atoll, Tuvalu. March 2007. These islands are very low lying and sucseptable to sea level rise.

Ashley Cooper / Beach on Funafuti Atoll, Tuvalu. March 2007. These islands are very low lying and sucseptable to sea level rise.

Ashley Cooper / Coconut seedling (Cocos nucifera) on beach, Funafuti Atoll, Tuvalu. March 2007. These islands are very low lying and susceptible to sea level rise.

Ashley Cooper / Man relaxing in hammock on a beach on Funafuti Atoll, Tuvalu. March 2007. These islands are very low lying and sucseptable to sea level rise.

Ashley Cooper / Funafuti Airport on Funafuti Atoll, Tuvalu, March 2007.

Ashley Cooper / Funafuti Atoll, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Aerial view of Funafuti atoll, Tuvalu, Pacific Ocean, March 2007

Ashley Cooper / Aerial view of Funafuti atoll, Tuvalu, Pacific Ocean, March 2007

Ashley Cooper / Aerial view of Funafuti atoll, Tuvalu, Pacific Ocean, March 2007

Ashley Cooper / Funafuti Atoll flooded by sea water, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Funafuti Atoll flooded by sea water, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Funafuti Atoll flooded by sea water, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Tuvaluan children leaping into the sea on Funafuti Atoll, Tuvalu. March 2007

Ashley Cooper / Tuvaluan children leaping into the sea on Funafuti Atoll, Tuvalu. March 2007

Ashley Cooper / Funafuti Atoll flooded by sea water, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Funafuti Atoll flooded by sea water outside Funafuti airport, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Tuvaluans watching as the high tide inundates their island home on Funafuti Atoll, Tuvalu. These low lying islands are very susceptible to sea level rise, March 2007

Ashley Cooper / Floodwater inundating, Funafuti Atoll, Tuvalu. This area is particularly vulnerable to global warming induced sea level rise. March 2007

Ashley Cooper / Rubbish on Funafuti Atoll, Tuvalu. March 2007

Ashley Cooper / Rubbish on Funafuti Atoll, Tuvalu. March 2007

Alex Mustard / Star puffer (Arothron stellatus) swimming through Black coral (Antipatharia) in coral reef. Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Sixbar grouper (Cephalopholis sexmaculata) in overhang on a coral reef. South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Reef manta (Mobula alfredi) at a cleaning station with Cleaner wrasse (Labroides dimidiatus). South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Blueline snapper (Lutjanus kasmira) school above Black coral (Antipatharia) in reef. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Brassy chub (Kyphosus vaigiensis) swimming through channel in coral reef at dusk. Alimatha Island, Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Spotted eagle ray (Aetobatus narinari), female swimming over coral reef. Individual appears heavily pregnant. South Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Spotted eagle ray (Aetobatus narinari) female swimming over coral reef. South Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Oriental sweetlips (Plectorhinchus vittatus) schooling above coral reef. Lankan Island, North Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Giant moray (Gymnothorax javanicus), Honeycomb moray (Gymnothorax favagineus) and Undulated moray (Gymnothorax undulatus) eels, four emerging from hole in coral reef. North Male Atoll, Maldives. India...

Alex Mustard / Remora (Remora remora) schooling beneath dive boat on a coral reef. North Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Honeycomb moray (Gymnothorax favagineus) on coral reef with Triggerfish (Balistidae) schooling above. North Male Atoll, Maldives. Indian Ocean.

Richard Robinson / Aerial view of wreck of a of longlining fishing boat on Ceva-I-Ra Reef also known as Conway Reef a small coral reef atoll in the republic of Fiji. .

Richard Robinson / Aerial view of Ceva-I-Ra Reef also known as Conway Reef a small coral reef atoll, Fiji. August 2017.

Jordi Chias / Yellowfin goatfish (Mulloides vanicolensis) inside lagoon Toau Atoll, Tuamotu archipelago, French Polynesia, Pacific Ocean.

Jordi Chias / Whale shark (Rhincodon typus), south Ari Atoll, Maldives islands

Jordi Chias / Convict surgeonfish (Acanthurus triostegus) Gafu atoll, Indian Ocean, Maldives.

Jordi Chias / Convict surgeonfish (Acanthurus triostegus) Gafu atoll, Indian Ocean, Maldives.

Jordi Chias / Table coral (Acropora) with Giant clams (Tridacna gigas) Addu Atoll, Maldives, Indian Ocean.

Jordi Chias / Table corals reef in shallow waters,Gaafu Alifu Atoll, Maldives, Indian Ocean.

Jordi Chias / Table corals reef in shallow waters,Gaafu Alifu Atoll, Maldives, Indian Ocean.

Jordi Chias / Table coral reef in shallow waters, Gaafu Alifu Atoll, Maldives, Indian Ocean.

Jordi Chias / Table coral reef in shallow waters, Gaafu Alifu Atoll, Maldives, Indian Ocean.

Jordi Chias / Laced moray (Gymnothorax favagineus), Ari atoll, Maldives islands, Indian Ocean

Jordi Chias / Dead coral, bleached by warm waters, South Ari Atoll, Maldives Islands, Indian Ocean.

Jordi Chias / Giant manta (Manta birtostris) swimming over the reef, Ari Atoll, Maldives Islands. Indian Ocean

Jordi Chias / Giant manta (Manta birtostris) swimming over a cleaning station, Malet Atoll, Maldives islands.

Jordi Chias / Reef octopus (Octopus cyanea) in the reef, South Ari Atoll, Maldives Islands, Indian Ocean.

Jordi Chias / Laced moray (Gymnothorax favagineus), Ari atoll, Maldives islands, Indian Ocean.

Alex Mustard / Diver swimming along a reef wall covered in colurful soft corals. South Male Atoll, Maldives. Indian Ocean. Model released.

Franco Banfi / Spotted hawkfish (Cirrhitichthys oxycephalus), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Scuba diver with honeycomb moray eel (Gymnothorax favagineus) at burrow, Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Blue-fin trevally (Caranx melampygus) and scuba diver with soft coral (Dendronephthya), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Soft coral (Dendronephthya), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Soft coral (Dendronephthya), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Gorgonian fan (Subergorgia mollis) with jewel basslet (Pseudanthias squamipinnis), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Gorgonian fan (Subergorgia mollis) with scuba diver in background, Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Alex Mustard / Red seafan (Melithaea sp) South Atoll, Tubbataha Atolls, Tubbataha Reefs Natural Park, Palawan, Philippines. Sulu Sea.

Alex Mustard / A busy coral head, with hard and soft corals. South Atoll, Tubbataha Atolls, Tubbataha Reefs Natural Park, Palawan, Philippines. Sulu Sea.