Neil Lucas / Camerman Doug Allan at frozen water surface of drilled ice hole, BBC film crew, McMurdo Sound, Ross Sea, Antarctica, November 2008

Jeff Rotman / Diver holds 20 kilo Northern / American Lobster (Homarus americanus) with claws open, demonstrating aggressive behavior, New England, USA, North Atlantic Ocean. Model released Model released.

Wild Wonders of Europe / Lundgren / Photographer, Magnus Lundgren, in diving gear with photography equipment, Saltstraumen, Bod, Norway, October 2008, photographed by Klas Malmberg, model released

Mark Brownlow / Rebreather instructor Ian Thomas and cameraman Didier Noirot prepare to dive under the ice, Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia. BBC Plane...

Nuno Sa / Blue Shark (Prionace glauca) near sea surface and diver with photographic equipment. Santa Maria, Azores, September.

Nuno Sa / Blue Shark (Prionace glauca) and diver with underwater photographic equipment. Santa Maria, Azores, September.

Roberto Rinaldi / Rebreather diver swimming along the sea bed. Capraia, Tuscany, Italy, August. Model released.

Toby Roxburgh / Dive instructor and trainees beginning their dive off Kanoni Beach, northern Corfu, Greece, June 2010.

Roberto Rinaldi / Group of divers on dive boat visiting wreck of crude oil super-tanker "Amoco Milford Haven", which sank on April 14th, 1991 after three days of fire. Genoa, Italy, August 2007.

Tim Laman / Split level view of a diver inspects a soft coral growing on a fallen tree trunk, in a passage between Waigeo and Gam Islands. This unique area is protected from waves but experiences high currents w...

Tim Laman / Split level view of a diver inspecting a soft coral growing, in a passage between Waigeo and Gam Islands. This unique area is protected from waves but experiences high currents which allows soft coral...

Tim Laman / Split level view of a diver inspecting a soft coral, in a passage between Waigeo and Gam Islands. This unique area is protected from waves but experiences high currents which allows soft corals to flo...

Tim Laman / Split level view of diver Zafer Kizilkaya explores a passage between Gam and Waigeo Islands, rich with soft coral growth. Raja Ampat Islands, Indonesia, May 2007

Neil Lucas / Doug Allan, BBC cameraman and another, preparing to enter ice-hole for underwater filming, McMurdo Sound, Ross Sea, Antarctica, November 2008

Wild Wonders of Europe / Lundgren / Photographer, Magnus Lundgren, with equipment, Saltstraumen, Bodö, Norway, October 2008, photographed by Klas Malmberg. Model released

NEIL NIGHTINGALE / Sir David Attenborough in scuba diving equipment on location for BBC television series "Private Life of Plants", early 1990s. Heron Island, Great Barrier Reef, Australia

Doug Allan / Doug Allan, cameraman, filming with underwater camera for National Geographic, Canadian Arctic

Juergen Freund / Researcher uses underwater fluorometer to measure health of coral polyps, Great Barrier

Doug Allan / Doug Allan filming Great White sharks in shark cage Pacific Ocean, 2003

Angelo Giampiccolo / Couple in wetsuits ready to go scuba diving from the stern of a power boat, with the transom doors open. Motorboat "One", Cantieri di Baia, off the coast of Baia, Naples, Italy.

Angelo Giampiccolo / Couple in wetsuits ready to go scuba diving from the stern of a power boat, with the transom doors open. Motorboat "One", Cantieri di Baia, off the coast of Baia, Naples, Italy.

Angelo Giampiccolo / Couple in wetsuits ready to go scuba diving from the stern of a power boat, with the transom doors open. Motorboat "One", Cantieri di Baia, off the coast of Baia, Naples, Italy.

Angelo Giampiccolo / Couple in wetsuits ready to go scuba diving from the stern of a power boat, with the transom doors open. Motorboat "One", Cantieri di Baia, off the coast of Baia, Naples, Italy.

Angelo Giampiccolo / Couple in wetsuits ready to go scuba diving from the stern of a power boat, with the transom doors open. Motorboat "One", Cantieri di Baia, off the coast of Baia, Naples, Italy.

Roberto Rinaldi / A diver setting up his equipment before scuba diving inside a flooded crevasse, Perito Moreno glacier, Los Glaciares National Park, Patagonia, Argentina