Alex Mustard / A diver explores Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this phot...

Eric Baccega / Climbers crossing the Plan de lAiguille Aiguille du Midi Alps France

Jordi Chias / Woman snorkeller swimming inside lagoon Toau atoll, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Jack Dykinga / Eroded Chinle shale mounds with colour bands, beneath the Paria Plateau, Vermilion Cliffs National Monument, Paria Canyon Vermilion, Arizona, USA.

David Pattyn / Children snorkelling in the sea and swimming with bottlenose dolphins (Tursiops truncatus) with boat approaching. Indian Ocean, Zanzibar, Tanzania, August 2014.

Franco Banfi / Great white shark (Carcharodon carcharias) swimming in front of scuba diving cages, Guadalupe Island, Mexico, Pacific Ocean. September 2011.

Juan Carlos Munoz / Tourist paddling among mangroves in canoe, Puerto Jimenez, Golfo Dulce, Osa Peninsula, Costa Rica.

Sven Zacek / Cross-country skiier on a moonlit night admiring the Northern Lights (Aurora borealis), Norway, March 2013.

Juan Carlos Munoz / Tourists hiking along dirt track, Triglav National Park, Julian Alps, Slovenia, October 2010.

Ole Jorgen Liodden / Boy on skis going up slope, framed by snow laden tree, Norway, February 2014.

Hugh Pearson / Leopard (Panthera pardus) resting, Erindi Game Reserve, Namibia.

Brandon Cole / Whale shark (Rhincodon typus), view from underneath as four people swim alongside, Gulf of Mexico, Mexico, Caribbean Sea.

Olga Kamenskaya / Man looking into ice hole dug for ice diving, Lake Baikal, Siberia, Russia, March. Model released.

Angelo Gandolfi / Snorkeller with shoal of Piraputanga (Brycon hilarii), Rio Olha d'Agua at Cabeceira do Prata, Bonito, Mato Grosso do Sul, Brazil

Doug Perrine / Scuba diver films bait ball of Bigeye scad (Selar crumenopthalmus) Keauhou Bay, Kona, Hawaii, Hawaiian Islands. Central Pacific ocean. March 2010. Model released.

Michael Pitts / Diver Ron Howse ascending the shot line in Lyme Bay, off Portland Bill, Dorset, England, UK, September 2010. Model released.

Michael Pitts / British Admiralty anchor - mid 1750's - possibly from the wreck of HMS Colossus - wrecked 1798. St Mary's Roads. Isles of Scilly. England, UK, August 2013. No release available.

John Waters / Walkers strolling along the bank between in flooded Aller Moor, with mistletoe laden apple tree, near Burrowbridge, Somerset Levels, Somerset, UK. January 2014

Eric Baccega / Male Ostrich (Struthio camelus) protecting chicks from the sun with its wings, Samburu National Reserve, Kenya, Africa.

Peter Cairns / Tourists watching American bison (Bison bison) Yellowstone National Park, Wyoming, USA, February 2013.

Jean E. Roche / Firework in Arles over the Rhone, Camargue, France, July 2012.

Kirkendall-Spring / Close up on mountain biker's foot pedalling, in Cascade foothills, Washington, USA. April 2013. Model released.

Ingo Arndt / Great Bowerbird (Chlamydera nuchalis) male at courting bower, Litchfield National Park, Australia.

Erlend Haarberg / Stoat (Mustela erminea) in white winter coat, trying to steal fish (trout) hanging on transparent fishing line. Vauldalen, Sor-Trondelag, Norway, April

Diane McAllister / Japanese Macaques (Macaca fuscata) enjoy time soaking and grooming in the hot spring in Jigokudani, Japan.

Chris & Monique Fallows / Split level shot of Great white shark (Carcharodon carcharias) fin above the water and leisure boat in the background, with Seal Island, False Bay, South Africa.

Franco Banfi / Scuba diver and yellow sponges (Aplysina cavernicola) on Brioni Steamship wreck, Vis Island, Croatia, Adriatic Sea, Mediterranean. Model released.

Franco Banfi / Scuba diver under and between ice formations, Lake Sassolo, Sambuco valley, Ticino, Switzerland. Model released.

Franco Banfi / Diver with rebreather inside sea cage used for aquaculture with thousand of Gilt-head bream (Sparus aurata) Ponza Island, Italy, Tyrrhenian Sea, Mediterranean. Model released.

Franco Banfi / Diver with rebreather inside sea cage used for aquaculture with thousand of Gilt-head bream (Sparus aurata) Ponza Island, Italy, Tyrrhenian Sea, Mediterranean. Model released.

Franco Banfi,Franco Banfi / Pygmy seahorse, not currently described hiding in sea fan, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Franco Banfi / Two women snorkeling in front of the cave, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean. Model released.

Franco Banfi / Scuba diver and Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean. Model released.

Franco Banfi / Scuba diver under ice, Sassolo lake, Sambuco valley, Ticino, Switzerland. Model released.

Andy Rouse / Cheetah (Acinonyx jubatus) cub looking around mother's legs Maasai Mara, Kenya, Africa

Eric Baccega / Juvenile Grizzly bear swimming in the estuary (Ursus arctos horribilis) Khutzeymateen Grizzly Bear Sanctuary, British Columbia, Canada, June 2013.

Alex Mustard / A diver explores Chac Mool Cenote (or sinkhole) Puerto Aventuras, Quintana Roo, Mexico. No release available.

Alex Mustard,Alex Mustard / Veined octopus (Amphioctopus marginatus) shelters in discarded coconut shell. Lembeh Strait, North Sulawesi, Indonesia. Molucca Sea.

Alex Mustard,Alex Mustard / Divers explore mediaeval mill building, now flooded in Capodacqua lake. Gran Sasso National Park, Abruzzo, Italy.