Fort Halstead
Repurchased by Ministry of Defence in 1937 for work on anti aircraft rockets and currently within the boundary of DERA Fort Halstead, an MoD research
establishment.
some one else posted this info,apparentley this base has upto 30 levels!
if you do a google search for military sites you can get some good info on locations and what the bases have or were used for (well as much as they
will tell the public anyway)
A freind of mine worked for a telecommunications company in Manchester at a very high level (ex-military) and he did some work in some large tunnel
networks under the city,he was told they were cold war remants,as im sure they were but he said that he noticed some very modern radio equipment down
there and period extras.The tunnels were big enough to drive a truck down yet few people seemed aware of their exsistence?