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.

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

Jurgen 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.

Jurgen 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

Shane Gross / Coral reef scene with red sea whips (Ellisella sp) and a scuba diver in the background. Kimbe Bay, Papua New Guinea.

Shane Gross / A scuba diver with light looks at a beautiful coral reef with feather stars (crinoid) and red whip corals / sea whips (Ellisella sp) in Kimbe Bay, Papua New Guinea.

Georgette Douwma / Kaleidoscopic image of coral reef with Red sea whips (Ellisella ceratophyta). Misool, Raja Ampat, West Papua, Indonesia.

Linda Pitkin / Sea whips, gorgonian coral (Ellisella sp.) Cape Kri, Dampier Strait, Raja Ampat, West Papua, Indonesia, March 2016

Georgette Douwma / Delicate sea whips (Junceella fragilis) forest with a Golden damselfish (Amblyglyphidodon aureus) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Red sea whips (Junceella juncea) growing on granite boulder. Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Coral reef with a Coral hind (Cephalophus miniata), Delicate sea whips (Jungceellia fragilis) and a large number of Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.

Jurgen Freund / Harlequin ghost pipefish (Solenostomus paradoxus) amongst Red sea whips (Ellisella sp) Kimbe Bay, New Britain, Papua New Guinea.

Pascal Kobeh / Diver above the reef with Caribbean sea whips (Plexaura homomalla), Elephant ear sponge (Agelas clathrodes) and a Great star coral (Montastraea cavernosa), San Salvador Island / Colombus Island, Baham...

Sue Daly / Gorgonian fan (Gorgonacea sp.) and diver Poor Knights Islands, New Zealand, January 2013. Model released

Franco Banfi / Red / Blotcheye soldierfish (Myripristis murdjan) and sea whips coral, Junceella at Fotteyo caves, Maldives, Indian Ocean

Franco Banfi / Red / Blotcheye soldierfish (Myripristis murdjan) and sea whips coral, Junceella at Fotteyo caves, Maldives, Indian Ocean

Jurgen Freund / Gorgonian fan corals, Raja Ampat, West Papua, Indonesia

Jurgen Freund / Gorgonian fan corals in Raja Ampat coral reef, near to mangroves, Raja Ampat, West Papua, Indonesia

Jurgen Freund / Gorgonian fan corals (Gorgonacea) split level with mangroves, Raja Ampat, West Papua, Indonesia

Jurgen Freund / Gorgonian fan corals (Gorgonacea) in Raja Ampat coral reef, West Papua, Indonesia

Brandon Cole / Soft corals (Dendronephthya sp.), gorgonian sea fans (Subergorgia mollis), sea whips, and purple anthias fish (Pseudanthias spp.). Fiji, tropical Pacific Ocean.

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

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

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

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

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

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

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

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

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

Jurgen 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.

Jurgen 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.

Jurgen 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.

Jurgen 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.

Jurgen 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.

Jurgen 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.