Four men and a girl descend into the depths beneath Kingsdale in the Yorkshire Pennines.
Cameraman Sid Perou, an expert potholer in his own right, goes with them as they risk life and limb to explore the treacherous stream-filled labyrinths.
Discover 11,128,835 listings and 279,901 playable programmes from the BBC
Four men and a girl descend into the depths beneath Kingsdale in the Yorkshire Pennines.
Cameraman Sid Perou, an expert potholer in his own right, goes with them as they risk life and limb to explore the treacherous stream-filled labyrinths.
BBC One is a TV channel that started broadcasting on the 20th April 1964. It replaced BBC Television.
