Monitoring Equipment, Hack Green Secret Nuclear Bunker
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/43729">David Dixon</a>
CC BY-SA 2.0
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/6173227">geograph.org.uk</a>