Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Jeff Rotman / Gorgonian Seafan Coral (Gorgonacea) polyps open to feed at night. South China Sea, Sipadan Island, Borneo.

Bryan and Cherry Alexander / Inuit hunter travelling by dog sled during the polar night. Northwest Greenland, 1987. 40 BELOW bookplate.

Juergen Freund / Fan coral (Gorgonacea) with open polyps. Misool, Raja Ampat, West Papua, Indonesia..

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

Tim Laman / Denise's Pygmy seahorse (Hippocampus denise) camouflaging itself in a Sea Fan. Yellow colour form. Pisang Islands, West of Fak Fak Peninsula. West Papua, Indonesia, April 2007

Bryan and Cherry Alexander / Inuk cracking his whip to encourage Huskies (Canis familiaris) over the sea ice. Igloolik, Nunavut, Canada, 1993.

Juergen Freund / Orange elephant ear sponge (Agelas clathrodes), with other sponges and gorgonians, Indo-pacific

Chris Newbert / Reef scenic at one-hundred-twenty feet, showing Soft Corals, Sea Fans, Crinoids, Leather Corals, Sea Whips and Sponges, Solomon Islands

Chris Newbert / Underwater reef scene with Sea Whips, Gorgonian Whip Coral, blossoming Soft Corals, Guard Plate Coral, and schools of Pseudanthias, Red Sea, Egypt

Fred Bavendam / Butterfly Perch (Caesioperca lepidoptera) swimming amidst Gorgonian Sea Whips, fans and various kinds of sponges at 40 meters depth, Tasman Peninsula, Tasmania, Australia

Fred Bavendam / Butterfly Perch (Caesioperca lepidoptera) and diver swimming amidst Gorgonian Sea Whips, Fans and various kinds of Sponges at 40 meters depth, Tasman Peninsula, Tasmania, Australia

Claudio Contreras / Neotropical Whipsnake (Masticophis mentovarius striolatus) portrait. Maria Magdalena Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Alex Mustard / Red clingfish (Arcos rubiginosus) living on a deepwater sea fan (Iciligorgia nodulifera) on the reef wall, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Coral reef outcrop with brown tube sponges (Agelas conifera) deepwater sea fans (Iciligorgia nodulifera) and knobby cactus coral (Mycetophyllia aliciae) East End, Grand Cayman, Cayman Islands, Britis...

David Shale / Detail of deepea seafan (Narella sp) from a coral seamount in the Indian Ocean, November 2011

David Shale / Deepea seafan (Narella sp) from a coral seamount in the Indian Ocean, November 2011

Juergen Freund / Red whip corals / sea whips (Ellisella sp) West New Britain, Papua New Guinea.

Juergen Freund / Two whip corals intertwined, Komodo NP, Indonesia.

Juergen Freund / Whip coral on coral reef, Komodo NP, Indonesia.

Juergen Freund / Red whip corals / sea whips (Ellisella sp) bending in the current, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Fan coral with polyps fully extended, West Papua, Indonesia.

Juergen Freund / Detail of a fan coral with polyps fully extended, West Papua, Indonesia.

Juergen Freund / Large Fan coral (Gorgonacea) in the shallows. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Fan corals (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Fan coral (Gorgonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Large Fan coral (Gorgonacea) and soft corals (Alceonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Large Fan corals (Gorgonacea). Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Large Fan coral (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Fan coral (Gorgonacea) in the reef. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Fan corals (Gorgonacea) on the coral wall. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Large Fan coral (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan corals (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish, with a distant diver in the background. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Large Fan corals (Gorgonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Fan corals (Gorgonacea) in the reef. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan corals (Gorgonacea) on the coral wall. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Fan corals (Gorgonacea) on the coral wall. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan coral (Gorgonacea) in the shallows, surrounded by mangrove roots and tiny fish. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan corals (Gorgonacea) and Soft corals (Alceonacea) in the reef, surrounded by reef fish. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Close-up of Fan coral (Euplexaura sp) Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the foliage of the trees visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / A massive Fan coral (Gorgonacea) in the shallows with the a dive boat visible through the water above. North Raja Ampat, West Papua, Indonesia, February.

Juergen Freund / Fan coral (Gorgonacea) with open polyps. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Split-level shot of a massive Fan coral (Gorgonacea) in the shallows and the foliage of the trees above. North Raja Ampat, West Papua, Indonesia, February 2010.

Juergen Freund / Fan coral (Gorgonacea) with open polyps. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Fan coral (Gorgonacea) with open polyps. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Pygmy seahorse (Hippocampus denise) on a red sea whip - not its usual fan coral habitat, in which it is much better camouflaged. Misool, Raja Ampat, West Papua, Indonesia,

Juergen Freund / Fan coral (Gorgonacea) in the shallows. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Colorful coral reef with Soft corals (Alcyonacea) and Fan corals (Gorgonacea). Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Red whip corals / sea whips (Ellisella sp) Kimbe Bay, Papua New Guinea, Indo-pacific.

Juergen Freund / Split-level shot of Fan coral (Gorgonacea) in the shallow mangrove area. North Raja Ampat, West Papua, Indonesia, February 2010

Juergen Freund / Fan corals (Gorgonacea) in the reef. North Raja Ampat, West Papua, Indonesia, February

Juergen Freund / Eggs of Golden damselfish (Amblyglyphidodon aureus) on a Whip coral. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Pink Fan coral (Gongonacea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Pink Fan coral (Gorgonacea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Fan corals (Gorgonacea) and Feather star (Crinoidea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Fan corals (Gorgonacea) and Feather star (Crinoidea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Split-level shot of Fan corals (Gorgonacea) and Feather star (Crinoidea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010

Juergen Freund / Fan corals (Gorgonacea) with Feather stars (Crinoidea) in the reef shallows. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Denise's pygmy seahorse (Hippocampus denise) on a red sea whip. Its usual habitat is a fan coral where it is much better camouflaged. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Fan corals (Gorgonacea) on the coral wall with diver in the background. Misool, Raja Ampat, West Papua, Indonesia, January 2010

David Shale / Deepsea Whip coral (Gorgonacea) from mid Atlantic Ridge,

Bryan and Cherry Alexander / Inuit hunter driving team of Huskies (Canis familiaris) across tidal ice in autumn near Savissivik. Northwest Greenland, 1991.

Tim Laman / Rich Soft Coral and Sea Fan covered reefs, teaming with fish life. Misool Island vicinity, near the smaller island of Wagmab. West Papua, Indonesia, April 2007

Tim Laman / Pygmy Seahorse (Hippocampus bargibanti) in yellow colour phase camouflaged in a yellow Sea Fan. West Papua, Indonesia, April 2007

Tim Laman / Pygmy Seahorse (Hippocampus bargibanti) in yellow colour phase camouflaged in a yellow Sea Fan. West Papua, Indonesia, April 2007

Bryan and Cherry Alexander / Inuit hunter standing on sled pulled by Huskies (Canis familiaris) for better view across sea ice. Northwest Greenland, 1980.

Bryan and Cherry Alexander / Inuit hunters travelling by dog sled pulled by Husky dogs (Canis familiaris) on seal hunt in spring. Northwest Greenland, 1977.

Georgette Douwma / Sea whips (Junceella fragilis) on coral reef. Philippines

Juergen Freund / Red whip corals / sea whips (Ellisella sp) and various sponges on coral reef, Indo-pacific

Juergen Freund / Whip corals / Sea whips (Ellisella sp) and featherstars (Crinoidea), on coral reef, Indo-pacific

Juergen Freund / Red whip corals / sea whips (Ellisella sp) and various sponges on coral reef, Indo-pacific

Juergen Freund / Hard corals grow on a sponge that is attached to a gorgonian fan coral. Indo-pacific

Juergen Freund / Colourful gorgonian sea fan (Gorgonacea) and soft corals, with small fish, and a diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Colourful gorgonian sea fan (Gorgonacea) and soft corals, with diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Gorgonian sea fan (Gorgonacea) and soft corals, with fish in the background. Rowley Shoals, Western Australia

Juergen Freund / Colourful gorgonian sea fan (Gorgonacea) and soft corals, with diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Colourful gorgonian sea fan (Gorgonacea) and soft corals, with diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Gorgonian sea fan (Gorgonacea) with diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Sea fan coral {Gorgonacea} with Reef basselets {Grammidae} Philippines

GEORGETTE DOUWMA / Sea fan or Gorgonian (Laphogoria chitensis) in Giant kelp forest. California, USA.

Jeff Rotman / Gorgonia Coral (Gorgonacea sp.) with retracted polyps. Papua New Guinea.

Juergen Freund / Schooling Razorfish / Shrimpfish {Aeolicsus strigatus} over sea whips with diver. Papua New Guinea

Birgitte Wilms / Sea Fan (Melithaea sp) Sea Fan (Acabaria sp) Sea Whips (Ctenocella ellisella sp) and Golden Damselfish (Amblyglyphidodon aureus) 100 feet deep, Solomon Islands

Chris Newbert / Sea Whips on Palau reef, Palau

Fred Bavendam / Diver swimming among boulders covered with Sponges, Golden Zoanthid and Gorgonian Sea Whips, Tasman Peninsula, Australia

Fred Bavendam / Diver at the Golden Boomie, a rocky pinnacle covered with Golden Zoanthids, Sea Whips and Sponges, Bicheno, Australia

Roberto Rinaldi / A cave full of sea fans and sea whips (Gorgonaceae sp.), Flinders Reef, Australia

Roberto Rinaldi / Coral reef with long sea whips (Ellisella elongata) in the foreground and the silhouette of a diver in the background, Roatan, Honduras. Model released.

Roberto Rinaldi / Vase sponge, tube sponges, sea-plumes and sea whips, Honduras.

Roberto Rinaldi / Gorgonian sea fan (Gorgonacea), Tubbataha reef, Philippines.

Roberto Rinaldi / Diver with colourful sponges, whip corals and pink jewel anemones, Tasmania, Australia.