Anyone recognise where he's talking about (on the through trip from cnwc):
"...the first narrow gap known as 'The Armageddon' - which is 16 inches wide.
They continue to delve deeper into the cave system before pushing into a tighter 12-inch tunnel known as 'The Death Squeeze'.
...He eventually manages to free himself before the pair arrive at their next challenge - a nine-inch tunnel nicknamed 'The Narrow Slump'."
Before arriving at " 'one of the most claustrophobic squeezes in the world' - a gap know as 'The Vice' which narrows to just four inches wide
." [My highlight]
(His previous experience was in a sensory deprivation box - I feel he should have stayed there)
But then, is the three counties traverse really "the longest journey in underground UK"?