Jordi Chias / Goliath grouper (Epinephelus itajara) inside a coral cave. Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Alex Mustard / Spotlight goby (Gobiosoma louisae) looking out from inside a Yellow tube sponge (Aplysina fistularis), growing on a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands, British West Indies. Car...

Brent Stephenson / Sunset off Scott Island, with floating pieces of sea ice, Scott Inlet, Baffin Island, Canadian Arctic, August 2015.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) cruising along the drop off of a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbean Sea. NB. Turtle has two identification tags in its fron...

Alex Mustard / Hairy pipehorse (Acentronura dendritica) female swimming over the seabed with her prehensile tail in the air. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbean Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) on a reef wall with a rope sponge. East End, Grand Cayman, Cayman Islands. Caribbean Sea.

Floris van Breugel / Bald eagle (Haliaeetus leucocephalus) flying in front of the massive wall of ice, Margerie Glacier, Glacier Bay National Park, Alaska, USA, August 2014.

Mark Taylor / Waves breaking against sea wall and cliffs, Seaford, Sussex, England, UK, 15th February 2014.

Alex Mustard,Alex Mustard / Green surf anemones (Anthopleura xanthogrammica) grow in shallow water below the temperate rain forest. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Franco Banfi,Franco Banfi / Local man looking down at shoal of Bigeye scad (Selar crumenophthalmus) Waigeo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Michael Pitts,Michael Pitts / Coral wall with Anthiinae schooling fish, Red Sea

Alex Mustard / Caribbean reef squid (Sepioteuthis sepioidea) North Wall, Grand Cayman, Cayman Islands, West Indies, Caribbean Sea