Man-made underground passage

In pasture, immediately S of a track running roughly E-W. A standing stone (LI056-017----) lies 55m to the NE. Not marked on 1840 ed. OSi 6-inch map. Annotated ‘Man-made underground passage’ on the Cassini ed. OSi 6-inch map where it is depicted as a small opening immediately S of a farm trackway where it intersects with a post 1700 field boundary running roughly E-W. No surface remains visible on Digital Globe orthoimage taken between 2011-2013 or on Google Earth orthoimages. See attached Google Earth orthoimage Compiled by: Fiona Rooney Date of upload: 25 November 2021