RNAD Trecwn, Military storage complex in Pembrokeshire, Wales.
RNAD Trecwn is a military storage complex in Pembrokeshire, Wales, featuring 58 underground cavern bunkers carved into the valley sides. An extensive network of railway tracks and tunnels connects all the storage facilities together.
The site was constructed in 1938 and served the Royal Navy as an armaments depot during World War II and the Cold War. It stored naval mines and ammunition for military operations and deterrence missions.
The facility shaped local work life by providing employment for hundreds of staff members who lived in Ministry of Defence housing nearby. This employer remained central to the regional community for decades.
The site has direct access to the London-Fishguard rail line and connects to the A40 road via a private access road. Visitors should plan routes carefully, as the location is remote and requires deliberate travel arrangements.
The internal railway system used copper materials instead of steel in its rails and fixtures to prevent spark generation during explosive transport. This unusual material choice was a safety requirement for handling sensitive munitions.
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