Underground Kent

Underground Kent is a site dedicated to the many underground features that can be found not just in Kent but in other areas. They are mostly military fortifications that have been built over the last three centuries, but other features that included tunnels can also be found here. All sites are man made, or in the case of mines, heavily influenced by industrial usage. The aim is to provide a glimpse into the rarely seen and often ignored world that exists beneath our feet.
Here you will find information on tunnels in Dover, Medway, Sheppey, Thanet, Grain and Other Areas.

from http://www.undergroundkent.co.uk/