One for Urbex preppers.

[NorthernRaider]

http://www.dailymail.co.uk/news/article-...ondon.html

[River Song]

Im actually old enough to remember seeing this live when I was a child

[NorthernRaider]

Did you Dad post you off some place ? First class stamp of course

---

Slightly more seriously I think it could be beneficial at times for the Urban preppers to find out about Sub Terr structures in their towns that may be of use if TSHTF either to travel through,, but out from, hide stuff in, shelter in etc.
There are some good Subterainian exploration organisations like Sub Brit
http://www.subbrit.org.uk/

and Urban exploration forums like 28 days later
http://www.28dayslater.co.uk/

[Sunna]

I do wonder what all the cables are for , not just lighting and power ... any ideas.

[NorthernRaider]

Yeah BT also uses the tunnels as well mainly fibre optics now but during the Cold War hardened land lines were ran in the tunnels as well to link government buildings.