<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Website </Td> </Tr> <P> Planet Earth is a 2006 British television series produced by the BBC Natural History Unit . Five years in the making, it was the most expensive nature documentary series ever commissioned by the BBC and also the first to be filmed in high definition . The series received multiple awards, including four Emmy Awards, a Peabody Award, and an award from the Royal Television Society . </P> <P> Planet Earth premiered on 5 March 2006 in the United Kingdom on BBC One, and by June 2007 had been shown in 130 countries . The original version was narrated by David Attenborough, whilst some international versions used alternative narrators . </P>

How long does it take to film a season of planet earth