Updated 6th May 2002; 26th April 2012; 6th January 2024

There has been confusion with this site and #4534, although they are hundreds of metres apart. Site 1623 had the description of 4534 but photos and a different description from a visit in 2012.
Site 1623, at Easter 2012, was described as a "crawl in 1.5m wide passage with cool air coming out".
The pre-GPS grid reference and notes read "VN53259853 (On the sketch survey GR is VN5325098625 - without GPS) Altitude 238m"

A survey sketch, originally named as 1623.jpg has now been correctly allocated to #4534.

Reference: anon., 2001a (Easter logbook); pers comm; Corrin Juan, 2003a; anon., 2012b (Easter logbook); anon., 2023e (Christmas logbook)
Entrance picture: yes
Underground picture(s):
Detailed survey:
Line survey:
On area survey:
Survex file: