It seems the BBC documentary link also returns a 404.
https://www.mailplus.co.uk/tv-guide/tv/394562/crashed-800m-f...
It's on BBC iPlayer - https://www.bbc.co.uk/iplayer/episode/m001n327/crashed-800m-...
alt Hacker News
It's on BBC iPlayer - https://www.bbc.co.uk/iplayer/episode/m001n327/crashed-800m-...