We Go Deep in to Tunnels at an abandoned Royal Navy Depot

RNMD Milford Haven is a "decommissioned" Royal Naval Armaments Depot located on the north shore of Milford Haven between Milford Haven and Llanstadwel in the County of Pembrokeshire, Wales.

In Part One of this video we explored the abandoned factory and in Part Two we urbexed the tunnels or magazines where the sea mines and explosives were stored.

In 1934, the Admiralty purchased the yard. Construction work began the following year and by the outbreak of war in 1939 the Depot was ready for action. The site consisted of an extensive storage facility of six armament sheds, comprising tunnels built into the neighbouring valley. A reservoir was constructed on higher ground to the north in case of explosion or fire. All of the tunnels were connected by rail, which also extended to the pier. Housing for the naval officers was located near the former mansion of Castle Hall. At the height of World War II, it employed 1,000 people, and thereafter hundreds of people from the local area. By the 1970s its future was identified as being at risk.

The site was closed in the 1980s. It was subsequently purchased by Gulf Oil, although the company never made any use of it. During the early 1990s, one of the buildings was converted into a sports facility. The area has been approved for large scale development into a retail and residential complex.

On 21 September 2015, Egnedol had announced that they bought the RNMD site and the old Gulf refinery and has put forward a £685M plan to redevelop the site as a renewable energy facility, but it failed to get planning permission. On 5 January 2017, the Port of Milford Haven announced it had completed acquisition of the western end of the site known as Wards Yard, which had been due to go to auction in December 2016.

The site now remains empty and derelict. A shadow of its former self. But with tensions in the world rising again who knows the future holds.