David Fleetham / Commerson's frogfish (Antennarius commerson) camouflaged against coral on bow of Alma Jane wreck, diver in background. Off Sabang Beach, Puerto Galera, Mindoro, Philippines. April 2017. Model rele...

Juergen Freund / Soft corals (Alcyonacea) on jetty pylon, Raja Ampat, West Papua, Indonesia

Michael Pitts / Funnel and corals on the wreck of the Japanese war wreck - 'Kasi Maru'. Bairoko Harbour. Solomon Islands. November 2008

Michael Pitts / Soft corals growing at the base of the forward mast on the Japanese merchant vessel 'Kasi Maru' Bairoko Harbour, Solomon Islands, November 2009

Sue Daly / Wreck of the Rainbow Warrior boat, Cavalli Islands, New Zealand, February

Jeff Rotman / Shipwrecked tanker on coral reef off Ras Muhammed, Red Sea, Egypt

Juergen Freund / The sunken wreck of HMAS Perth has formed an artifical reef off the coast of Albany, Western Australia

Juergen Freund / The sunken wreck of HMAS Perth has formed an artifical reef off the coast of Albany, Western Australia. Photographic display panel

Juergen Freund / Person diving the artifical reef which has developed on the sunken HMAS Perth. Albany, Western Australia

Michael Pitts / Looking down on the ventilators in the engine room of the shipwreck of the japanese WWII boat, 'Nippo Maru', Chuuk / Truk lagoon, Chuuk islands, Pacific ocean

Michael Pitts / Japanese Field Gun on the deck of the shipwrecked 'Nippo Maru', Truk / Chuuk Lagoon, Chuuk Islands, Pacific ocean

Michael Pitts / Bow gun on the wreck of the 'San Francisco Maru', Chuuk / Truk lagoon, Chuuk islands, Pacific ocean islands