Man-made underground passage in Knockaneacoolteen

See field inspection report (diary NF8, 164) (SMR file). According to the report, there is no local knowledge of these Man-made underground passages. The source of the information is Capt. D.B. O'Connell (see SMR file). This record was formerly classed as 'Man-made underground passages' in the SMR (1990), however, due to the uncertainty regarding these Man-made underground passages the classification has been changed to 'Man-made underground passages possible'.