Gavin Hellier / View along the Corniche towards the new skyline of the West Bay central financial district of Doha, Qatar, Arabian Peninsula, 2011. No release available.

Alex Mustard / Big fin reef squid (Sepioteuthis lessoniana) descends from open water to the reef at night. Arafur Sea, Triton Bay, West Papua, Indonesia.

Martin Dohrn / John Ruthven swimming in the Bioluminescence Bay in Vieques, Puerto Rico. Dinoflagellates create the bioluminescense when disturbed. Model released.

Alex Mustard / Pederson cleaner shrimp (Periclimenes pedersoni) cleaning the eye of a Nassau grouper (Epinephelus striatus), Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Alex Mustard / Caribbean spiny lobster (Panulirus argus) scampers across a coral reef amongst sponges, Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Alex Mustard / Lionfish (Pterois volitans) sitting on the rim of large sponge on Bloody Bay Wall, Little Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Spotted porcupinefish (Diodon hystrix) swimming in open water above a coral reef, West Bay, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Juergen Freund / Aerial view of Schumann Island in Kimbe Bay. West New Britain, Papua New Guinea, October 2008.

Juergen Freund / Detail of Orange elephant ear sponge (Agelas clathrodes) with crinoid / featherstar attached, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Gorgonian fan coral with crinoids / featherstars, Kimbe Bay, West New Britain, Papua New Guinea

Juergen Freund / Giant barrel sponge (Xestospongia testudinaria) studded with crinoids / featherstars with diver in the background, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Details of Orange elephant ear sponge (Agelas clathrodes) with crinoids / featherstars attached, Kimbe Bay, West New Britain, Papua New Guinea