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In WW II and the years after, few places in Britain were as secret as the Valley Works at Rhydymwyn near Mold. Set up in 1939 as a Shadow Factory to produce poison gas, the site had extensive underground storage facilities to keep mustard gas and related materials safe from bombing. There will be an opportunity during the visit to learn about the site’s even more secret role in the development of the atom bomb.

Visits to these tunnels are strictly limited by the site’s landlord DEFRA and The Newcomen Society has been able to book a party visit on the morning of Tuesday 21st May.

If you are interested in joining the party, please e-mail: meetings.north.western@newcomen.com

There will be a small charge to include a buffet lunch on site.

For further information about the Valley Works including how to find the site, please visit rhydymwynvalleyhistory.co.uk