Map Reference SM93SE
Grid Reference SM97283256
Unitary (Local) Authority Pembrokeshire
Old County Pembrokeshire
Type of Site MILITARY CAMP
Broad Class Defence
Period Post Medieval
Site Description The former naval depot at Trecwn is virtually hidden from the outside world in a narrow valley south of Fishguard. It was built at the start of the Second World War as a munitions storage facility and has fifty-eight long storage tunnels dug into the hillsides, all served by a purpose-built railway network. The railway was made of copper to reduce sparks when transporting explosives. A series of interesting bunkers survive in the valley bottom to the north-east at SM 991333 and SM 991335, recorded during RCAHMW aerial reconnaissance.
T. Driver, RCAHMW, 20th March 2009.