The remains of an Auxilliary Unit Operational Base, set just below ground in a woodland area, east-north-east of Plas Cilybebyll. Built in areas where a German invasion was expected in the Second World War, the structure consists of a single room, measuring 4.25 meters in length and 3.07 meters in width and 1.95 meters in height, with a curved corrugated sheet steel roof and side walls resting on low sills. The entrance shaft is located at the north-east end of the building.

Sources:

Cadw scheduling description of March 2011
Martin Locock, 'An Auxiliary Unit "Hide" (Operational Base) at Cilybebyll, Neath and Port Talbot, British Resistance Archive
Pontardawe Patrol, British Resistance Archive

Site Record

Cilybebyll Auxilliary Unit, Second World War Operational Base