A large collapse beyond the sink, site 4882. A hole at the base goes to a dig in large boulders and debris.
Other sites probably associated with this are 4884 and the resurgence, site 4885. Although there is only 170m straight line distance between the sink and the probable resurgence, there is potential for inlets entering from under the steep valley sides so the "system" may well warrant further investigation.
References: anon., 2019b (Easter logbook)
Entrance pictures : April 2019
Underground pictures : April 2019
Detailed survey :
Line Survey :
On area survey :
Survex file :