Bertons Pingles Pipe
Not clear who owns these sites or what the access situation is. Whole of Bradwell Dale is an SSSI, including these entrances.
(1974) Berton Pingles Pipe Vein., DCA N/L No.21., , Derbyshire Caving Association
(1978) , DCA N/L No.37., , Derbyshire Caving Association
(2000) , Descent No. 155., p.8., Wild Places Publishing
(2010) , Caves of the Peak District, p. 51, DCA