This historical documentary series was filmed some time ago!
The tunnels today are now locked and are not accessible to the public!
We are within the fortifications of the medway lines of Chatham in kent. These were built in the Napoleonic wars heres more
Gathering Darkness by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100849
Artist: http://incompetech.com/
Heavy Interlude by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100515
Artist: http://incompetech.com/
