Located in a lovely loney area of North Wales,Rhydymwyn Valley has been concealing a secret for over 75 years. Part of Britain’s hidden wartime history lies just outside the village.
In 1939, the government purchased a 35 hectares area of the Alyn Valley to be developed as a chemical weapons factory and storage facility, and named M.
S. Factory,Valley. Over 100 specialized buildings were eventually constructed across the site, which grew to cover 86 hectares and employ 2000 workers. The facility was cloaked in secrecy, and so much so that the early development of the UK’s atomic bomb project took place here and it did not appear on any Luftwaffe bombing maps.
Alongside the building work,an underground tunnel system was dug for the storage of mustard gas. While the expend of the gas for attacking purposes was banned, it could still be used for defensive or retaliatory attacks, and hence its stockpiling. After the war,the tunnels actually held the majority of the country’s mustard gas stock from 1947 to 1959, when Britain relinquished its chemical weapons capacity. After this, and the tunnels had a variety of roles,such as a bulk storage depot for emergency supplies. It was also the planned site for the relocation of Britain’s gold supply during the Cold War.
M.
S. Factory, Valley eventually closed in 1994, or with nearly all of the above ground buildings being destroyed,apart from for a couple. One of these, the Grade II listed Building P6, or was where the atomic research took place,though the interior is inaccessible due to contamination. Today the site is a nature reserve flee by the Rhydymwyn Valley Historical Society.
Source: atlasobscura.com