John Sparks / David Attenborough with mountain gorillas, on location during filming for BBC 'Life on Earth' series in Rwanda 1978

Stefan Christmann / Member of BBC Dynasties crew photographing on sea ice in light of full moon, during polar night. Atka Bay, Antarctica. July 2017.

Stefan Christmann / Cameraman Lindsay McCrae on ice overlooking Southern Ocean, filming for BBC Dynasties Penguin programme. Atka Bay, Antarctica. March 2017.

Stefan Christmann / Cameraman Lindsay McCrae on sea ice filming frozen landscape and icebergfor BBC Dynasties Penguin programme. Atka Bay, Antarctica. October 2017.

Stefan Christmann / Cameraman Lindsay McCrae filming Emperor penguin (Aptenodytes forsteri) colony for BBC Dynasties Penguin programme. Chicks are on sea ice whilst parents fish at sea. Atka Bay, Antarctica. December 201...

Jordi Chias / Underwater cameraman filming Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic Ocean.

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.

Felicity Lanchester,Felicity Lanchester / View of a BBC filming camp at night, on location for the Sahara episode of the 'Africa' series, Egypt, September 2011.

Michael Pitts / Cameraman Michael Pitts filming Green turtle (Chelonia mydas) Karan Island. Arabian Gulf, June 2009

Mark Carwardine / Stephen Fry and Mark Carwardine with Brown lemurs on Lemur Island in Andasibe-Mantadia National Park, eastern Madagascar, while filming for BBC TV series 'Last Chance to See', November 2008

Mark Carwardine / Stephen Fry and Mark Carwadine after a mud bath in Borneo, filming for BBC TV series 'Last Chance to See', March 2009

Chadden Hunter / Cameraman Jeff Turner and Producer Chadden Hunter exposed at -40 degrees in Arctic circle in Northern Canada while filming wolves and bison hunting sequence. Taken on location for BBC Frozen Planet se...