Mark Brownlow / Mark Brownlow, producer of Freshwater programme for BBC Planet Earth series, behind ice sheet, on location at Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia,...

Mark Brownlow / Rebreather instructor Ian Thomas and cameraman Didier Noirot prepare to dive under the ice, Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia. BBC Plane...

Mark Brownlow / Looking down on frozen surface of Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia. BBC Planet Earth series, April 2005

Mark Brownlow / Aerial view of Upper Yosemite Falls in Yosemite NP, California, USA. BBC Planet Earth series. May 2006

Mark Brownlow / Low aerial view of Iguazu falls, world's largest waterfalls that straddle Brazil and Argentina, Iguacu Falls NP, South America. BBC Planet Earth series. November 2005

Mark Brownlow / Kukenon, flat top tepuis, southern Venezuela, South America. November 2005, BBC Planet Earth

Mark Brownlow / Angel Falls, world's tallest waterfall, southern Venezuela, South America November 2005, BBC Planet Earth

Mark Brownlow / Aerial view of Snow goose (Chen caerulescens) flock in flight, part of annual migration, Bombay Hook NWR, Delaware Bay, Delaware, USA. November 2005, BBC Planet Earth

Mark Brownlow / Aerial view of Bombay Hook NWR, Delaware Bay, Delaware, USA. Salt marsh and refuge for migratory flocks of Greater snow geese. November 2005, BBC Planet Earth

Mark Brownlow / Aerial view of Bombay Hook NWR, Delaware Bay, Delaware, USA. Salt marsh and refuge for migratory flocks of Greater snow geese. November 2005, BBC Planet Earth

Mark Brownlow / Aerial view of Bombay Hook NWR, Delaware Bay, Delaware, USA. Salt marsh and refuge for migratory flocks of Greater snow geese. November 2005, BBC Planet Earth

Mark Brownlow / Aerial view of Great Barrier Reef, Queensland, Australia September 2006, BBC Planet Earth

Mark Brownlow / Rebreather instructor Ian Thomas and cameraman Didier Noirot prepare to dive and film under the ice, Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia. B...

Mark Brownlow / Film crew digging hole in ice for cameramen to dive in Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia, Russia on location for BBC Planet Earth series, April 2...

Mark Brownlow / BBC actors in re-enactment of the Whaleboat drama following the sinking of the Whaleship Essex by Sperm whales in the South pacific in 1820. February 2008

Mark Brownlow / Filming BBC actors in re-enactment of the Whaleboat drama following the sinking of the Whaleship Essex by Sperm whales in the South pacific in 1820. February 2008

Mark Brownlow / BBC actors in re-enactment of the Whaleboat drama following the sinking of the Whaleship Essex by Sperm whales in the South pacific in 1820. February 2008

Mark Brownlow / BBC actors in re-enactment of the Whaleboat drama following the sinking of the Whaleship Essex by Sperm whales in the South pacific in 1820. February 2008

Mark Brownlow / BBC actors in re-enactment of the Whaleboat drama following the sinking of the Whaleship Essex by Sperm whales in the South pacific in 1820. February 2008

Mark Brownlow / Red tailed tropicbird {Phaethon rubricauda} in flight, French Frigate Shoals, Hawaiian islands, Pacific

Mark Brownlow / Aerial view of rescuing a Sperm whale {Physeter macrocephalus} stranded beach, Australia, March 2007

Mark Brownlow / Close up of eye of stranded of Sperm whale {Physeter macrocephalus} Australia, March 2007

Mark Brownlow / Sperm whale {Physeter macrocephalus} swimming up a river, Australia, March 2007

Mark Brownlow / Rescuing a Sperm whale {Physeter macrocephalus} from being stranded in river, Australia, March 2007

Mark Brownlow / Sperm whale {Physeter macrocephalus} diving, tail fluke, New Zealand, March 2007

Mark Brownlow / Sperm whale {Physeter macrocephalus} diving, tail fluke, New Zealand, March 2007

Mark Brownlow / Seascape with clouds at sunset, Solomon Islands, Melanesia, Pacific ocean

Mark Brownlow / Young boy, Solomon Islands, Melanesia, May 2008

Mark Brownlow / Galapagos sealion pup {Zalophus californianus wollebackii} swimming underwater, Galapagos

Mark Brownlow / Scars on the back of a young man who has been through initiation ceremony when his flesh is wounded to create scars that represent being swallowed by a crocodile and re-born as a crocodile-man, Papua...

Mark Brownlow / Offshore scaffolding for swimmers, divers etc, French Frigate Shoals, Hawiian Islands, pacific, June 2007

Mark Brownlow / Sperm whale {Physeter macrocephalus} wounded, swimming up river being tracked by a conservation rescue boat, Australia, March 2007

Mark Brownlow / Sperm whale {Physeter macrocephalus} swimming up river, Australia, March 2007

Mark Brownlow / Young woman, Papua New Guinea, September 2007

Mark Brownlow / Washing the wounds of young man who has recently been through the initiation ceremony in which his flesh is wounded to create scars that represent being swallowed by a crocodile and re-born as a croco...

Mark Brownlow / Crops growing in field beside traditional hut, Papua New Guinea, September 2007

Mark Brownlow / Aerial view of mountains, river and valley, Papua New Guinea, August 2007

Mark Brownlow / Aerial view of moutains and valley, Papua New Guinea, August 2007

Mark Brownlow / Aerial view of moutains and valley, Papua New Guinea, August 2007

Mark Brownlow / Spirit dancers outside traditional building, Papua New Guinea, August 2007

Mark Brownlow / Human Skulls of tribesmen at burial site, Papua New Guinea, August 2007

Mark Brownlow / Human skulls of tribesmen at burial site, Papua New Guinea, August 2007

Mark Brownlow / Aerial view of the Sepik delta, Papua New Guinea, September 2007

Mark Brownlow / Aerial view of the Sepik delta, Papua New Guinea, September 2007

Mark Brownlow / Young man carried along after initiation ceremony in which his body is scared to represent being swallowed by a crocodile and re-born as a crocodile-man, Papua New Guinea, September 2007

Mark Brownlow / Aerial view of fringing coral reef, Papua New Guinea, August 2007

Mark Brownlow / Aerial view of mud line, Papua New Guinea, September 2007

Mark Brownlow / Aerial view of mountain village in Papua New Guinea, August 2007