RNAD Trecwn

Ownership of the site was transferred from the Ministry of Defence to Anglo-Irish consortium Omega Pacific in 1998, and then by court order to the Manhattan Loft Corporation in 2002.

Purposefully located on the former North Pembrokeshire and Fishguard Railway, it gave the site easy access to excellent rail distribution.

Direct passenger access was also provided by rail, with workmen's trains reversing in from the Fishguard and Goodwick railway station until 1 August 1964.

[4] Serviced via its own on-site locomotive shed and works, the line was equipped with a series of specially provided wooden enclosed wagons, with sliding roof covers.

This allowed sea mines and other munitions to be directly placed within the wagons from overhead gantries, and transported over the entire site without access via any form of side door, hence enhancing safety.

The entire site was sold to Anglo-Irish consortium Omega Pacific in 1998 for £329,000, with a stated intention of using the surface buildings for aircraft engine maintenance, while the caverns would be used for the storage of low-level nuclear waste.

However, a lack of planning consent (noise of the engines, level of radiation), and local opposition meant that the company ended up in court in 2002, and was ordered to sell the site to the Manhattan Loft Corporation, in conjunction with property developer Richard Harrington, within 10 weeks.

In late 2011, Renewable Developments Wales applied for planning permission to build a diesel-powered peaking plant on 14,000 square metres (150,000 sq ft) of land close to the former main entrance.

[6] Plans submitted by The Valley (Pembrokeshire) Ltd to build a 25-megawatt biomass energy plant on the site were conditionally approved in 2015, subject to an environmental permit from Natural Resources Wales (NRW),[7] but by August 2018 work, with the promise of 40 jobs, had not been started by current owners Manhattan Loft Corporation, leading to questions by the local councillor.