In March of 1994, Lt/Col Jeannie Schiff participated in a field investigation and excavation at Lima Site 85 (JFA 94-4L).  During this investigation an east-west tunnel was discovered in a north-south narrow ridge line just north of the operations van.  Mr. Robert J. Destatte who also investigated the site in December of 1994 and July 1998 states "It was very low and narrow.  One had to crouch down to pass through it.  It was carved through solid rock.  I am nearly certain that it was not natural."