A US historian wants to clear up the speculation that Edmund Hillary and Sherpa Tenzing, commonly recognised as the first men to reach the summit of Mount Everest, may have been beaten to the top some 29 years earlier by George Mallory and Andrew "Sandy" Irvine. Tom Holzel explains his mission to locate Irvine's body and camera.

Tom Holzel describes his plan and listens to Irvine's grand-niece Julie Summers explain why the mountain "should keep her secret".

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