The 161c entrance was originally explored by the
French Groupe
Spéléologique de Clerval - Baume les Dames under the
name VSS2 in 1988 and 1989, reaching -285m. They abandoned exploration
as it was apparent that it was going to connect into 161, though in fact,
that connection at depth wasn't made until 1995 and entailed the discovery
of a large amount of very impressive passage ! CUCC's explorations pushed
deeper and led to the huge sub-horizontal series off Triassic Park. Since
easier ways into those passages were found further down the mountainside,
this entrance has not been used.
Photo © Earl Merson, 1999