Bryan and Cherry Alexander / Chukchi girls, with their family's ancestral clan mark painted in reindeer blood on their face, a ritual during the Chukchi 'Festival of the Young Reindeer' during which young reindeer are sacrificed....

Bryan and Cherry Alexander / Sundogs (parhelia / parhelai) behind a 'Christmas tree' (valve assembly) in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A gas drilling derrick at sunset in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / Grisha (right) and Gosha Vanuitto, Nenets reindeer herders, at their winter camp on the tundra in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A 'Christmas tree' (valve assembly) in front of a gas drilling derrick in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / Oil storage tanks near Sabetta, South Tambey Gas field, Yamal, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / Icicles hanging from the edge of a small blue iceberg as the summer thaw sets in, Antarctica

Bryan and Cherry Alexander / Chinstrap penguins (Pygoscelis antarctica) on a blue iceberg, with Antarctic Prion (Pachyptila desolata) flying over. Antarctica

Bryan and Cherry Alexander / Emperor penguins (Aptenodytes forsteri) colony, with Snow petrel (Pagodroma nivea) flying past and dark sky. Atka Bay. Antarctica

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

Bryan and Cherry Alexander / Moonlit iceberg taken at midday during the polar night, Northwest Greenland, 1980. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit man pulling aside igloo door at dusk. Igloolik, Nunavut, Canada, 1993. 40 BELOW bookplate.

Bryan and Cherry Alexander / Gentoo penguin (Pygoscelis papua) standing on volcanic beach at Whalers Bay, with tourists in kayak beyond. Deception Island, South Shetland Islands, Antarctica, 2009.

Bryan and Cherry Alexander / Icicles at entrance to cave in a small iceberg, Antarctica, 2009.

Bryan and Cherry Alexander / Drygalski Glacier, which receded 300 metres between November 2008 and 2009, South Georgia, 2009.

Bryan and Cherry Alexander / King penguin (Aptenodytes patagonicus) in front of Grytviken Church in snow, South Georgia, 2009.

Bryan and Cherry Alexander / Gentoo penguins (Pygoscelis papua) in blowing sand with the "Ocean Nova" anchored beyond. Saunders Island, Falkland Islands, 2009.

Bryan and Cherry Alexander / Adelie penguin (Pygoscelis adeliae) on snow bank at Prospect Point with the mountains of Renaud Island beyond. Antarctica.

Bryan and Cherry Alexander / Zodiac filled with tourists seen through ice arch in an iceberg, Pleneau Island, Antarctica, February 2009.

Bryan and Cherry Alexander / Line of Emperor penguins (Aptenodytes forsteri) walking on sea ice. Flutter Rookery, East Antarctica.

Bryan and Cherry Alexander / Polo game at Leh, the capital of Ladakh, India, 1986.

Bryan and Cherry Alexander / Ribbon of clear blue ice runing through an iceberg, West Greenland, 1997.

Bryan and Cherry Alexander / Small fishing boat dwarfed by icebergs in the Icefjord. Ilulissat, Jacobshavn, West Greenland, 1995.

Bryan and Cherry Alexander / Ice-fishing huts on Mille Laks Lake. Minnesota, USA, 1985.

Bryan and Cherry Alexander / Commercial fisherman removing Atlantic salmon (Salmo salar) from stake net. St Cyrus Bay, Scotland, 1982.

Bryan and Cherry Alexander / Commercial fisherman removing Atlantic salmon (Salmo salar) from stake net. St Cyrus Bay, Scotland, 1982.

Bryan and Cherry Alexander / Tourists on icebreaker "Professor Multanovskiy" watching Polar bear (Ursus maritimus) in pack ice. Svalbard, Norway, 2004.

Bryan and Cherry Alexander / Northern lights (Aurora borealis) over a Nenets herders' camp. Yamal Peninsula, Western Siberia, Russia, 2001.

Bryan and Cherry Alexander / Northern lights (Aurora borealis) over a Nenets herders' camp. Yamal Peninsula, Western Siberia, Russia, 2001.

Bryan and Cherry Alexander / Northern lights (Aurora borealis) over a Nenets herders' camp. Yamal Peninsula, Western Siberia, Russia, 2001

Bryan and Cherry Alexander / Nenets boy pulling younger child on a sled. Yamal, Western Siberia, Russia, 2001.

Bryan and Cherry Alexander / Sun rises behind Reindeer / Caribou skin tents at a Nenets herders' winter camp. Yamal, Siberia, Russia, 1993.- 40 BELOW BOOK

Bryan and Cherry Alexander / Nenets herder selecting draught Reindeer / Caribou (Rangifer tarandus) from a corral. Yamal, Siberia, Russia, 1993.

Bryan and Cherry Alexander / Nenets boy learning to ski. Yamal, Siberia, Russia, 1993.

Bryan and Cherry Alexander / Nenets woman and boy at entrance to snow covered tent. Yamal, Siberia, Russia, 1993

Bryan and Cherry Alexander / Burning off impure gas in Gazprom's Yamsavey gas fields near Nadym. Yamal, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Pumping unit in the oil fields near Niznevartovsk. Khanty Mansiysk, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Converter aisle in the copper foundry at Norilsk. Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Worker silhouetted by red hot metal at the copper foundry in Norilsk. Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Tundra Nenets boy posing with Arctic hare (Lepus arcticus) he has shot. Gydan Peninsula, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Driving Reindeer / Caribou (Rangifer tarandus) across tundra at sunset. Khanty Mansiysk, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Khanty herder standing on sled, with Reindeer / Caribou (Rangifer tarandus). Khanty Mansiysk, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Girls looking through a window from inside their home in Verkhoyansk, Yakutia ,Siberia, Russia, 1999.

Bryan and Cherry Alexander / Boiling water exploding into vapour and ice when thrown into cold air at -51 degrees celsius. This is because boiling water is close to a gas and breaks into tiny droplets that freeze simultaneously....

Bryan and Cherry Alexander / Reindeer / Caribou (Rangifer tarandus) at their winter pastures in the mountains near Verkhoyansk. Yakutia, Siberia, Russia, 1999.

Bryan and Cherry Alexander / Nganasan woman running behind her team of Huskies (Canis familiaris). Taymyr, Northern Siberia, Russia, 2004.

Bryan and Cherry Alexander / Dolgan reindeer / caribou herder's balok (wooden hut built on sled runners) with chimney smoking. Taymyr, Northern Siberia, Russia, 2004.

Bryan and Cherry Alexander / Dolgan family of reindeer / caribou herders having meal together inside their balok (moveable hut built on sled runners). Taymyr, Northern Siberia, Russia, 2004.