Sir David Attenborough captured an extraordinary moment in nature television back in 1978 when a young gorilla climbed on top of him in the Rwandan jungle . However, the TV presenter has revealed that the footage almost never made it out of Africa – with his crew being stopped and interrogated by local police. Attenborough looks back on his stellar career in a new BBC documentary ahead of his 100th birthday on 8 May , with Making Life of Earth: Attenborough’s Greatest Adventure revisiting the award-winning 1979 docuseries. Reading from his diaries in the special, Attenborough reveals that the production crew had “no idea” that they were going to capture the now-iconic gorilla moment in Rwanda – “or how close we would come to losing everything”. David Attenborough opens up about making 'Life on Earth' in a new BBC documentary (PA) While heading back to the airport, the crew was stopped by a group of army soldiers, who began firing guns over their heads.…