For some, it’s one of the great unsolved mysteries of the Vietnam War. Forty years ago today, April 6th 1970, Sean Flynn, son of Hollywood legend Errol Flynn, was working as a war photographer when he set off on his motorbike from Phnom Penh with fellow journalist Dana Stone to cover the expansion of the conflict into Cambodia. They were never seen again. But now two amateur excavators are claiming they have discovered what happened to the men 40 years ago.

The BBC’s Guy DeLauney joins us from the Cambodian capital Phnom Penh to explain.