Known locally as Wards Yard, it was connected to the mainline railway via a spur from Milford Haven which crossed Castle Pill via a swing bridge.
A cast iron pier, built in 1872 with the intention of encouraging transatlantic traffic to unload, allowed a rail / marine interchange.
Construction work began the following year and by the outbreak of war in 1939 the Depot was ready for action.
[2] The site consisted of an extensive storage facility of six armament sheds, comprising tunnels built into the neighbouring valley.
[6] 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.