Rhydymwyn Tunnel Tour 2018 (3)
Introduction
The photograph on this page of Rhydymwyn Tunnel Tour 2018 (3) by Mike Searle as part of the Geograph project.
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Image: © Mike Searle Taken: 20 May 2018
One of the four storage caverns. From 1939 onwards, the bulk storage of mustard gas and chemically charged ordnance would have been stored here.