CORSHAM DECLASSIFIED Camera 1 Tape 4 Part 3 enhanced

Footage from Underground Corsham. May contain Spring Quarry, Burlington, CDCN, Copenacre, Tunnel Quarry, GOSCC and other places. We do not own the copyright of this footage - this is Crown Copyright reproduced here for educational and historical purposes only. Check out the other 18 tapes in this series... on this channel

0:00 - Burlington - Ventilation system
0:24 - Burlington - Ventilation system, butterfly valve, could be closed to stop contaminated air coming in (in theory)