Tunnel Quarry

© Crown Copyright: image reproduced with the permission of the Controller of Her Majesty‚Äôs Stationery Office.

Tunnel Quarry was one of the four sub-depots of the Central Ammunitions Depot, parts of the converted Bath stone quarry are still security classified sites today. The quarry connects to the northern edge of Spring Quarry and also had a link to the GWR main line at the eastern portal of Brunel's Box Tunnel.

Posted by Higgypop Admin last updated Tue 19 Aug 2008 at 15:46

Corsham, Wiltshire, United Kingdom

Grid reference: ST854693

No access

No access - this is an active Ministry of Defence site.

Visited by 2 explorers

Photos of Tunnel Quarry

Tunnel Quarry history

Located South-East of Bath, Tunnel Quarry forms part of the converted stone quarry tunnel complex beneath JSU Corsham (formerly known as RAF Rudloe Manor).

The quarry was acquired by the War Department after being used to extract building stone for the last century. The quarry was extensively converted, regular storage bays were created, the floor was flattened and air conditioning and lighting was fitted through out.

The regular conditions were needed as Tunnel Quarry formed part of the Central Ammunition Depot, an amazing labyrinth of tunnels and chambers, around one hundred feet below ground covering an area of around 200 acres in four sub-depots, which between them housed over 350,000 tons of ammunition.

At the eastern portal of Brunel's Box Tunnel, a branch line from the main London to Bristol railway line leads into the heart of the depot and terminates at a half-mile long underground railway station. Most of the underground area is now abandoned. The quarry is still strictly controlled by the MOD as several areas are still classified including the Command and Control Computer Centre (CCC) in the eastern part of the quarry, which is accessible via lift from a discreet bunker style entrance in Peel Circus. Another area known as South-West Control is also still in use at the opposite end of the quarry, this area was originally set a side as storage district 1 but it was never converted, it was later converted it to a telephone exchange and switching room, it's current day use is unknown.


Further reading



Related venues

  • Browns Quarry

    A small stone quarry to the north of tunnel quarry in Corsham which was converted and used as the underground headquarters of No. 10 Group Fighter Command and as a ROTOR training station, the site is now abandoned.
  • Box Quarry

    Box Quarry is an SSSI (Special Site of Scientific Interest) because of its national importance for hibernating and roosting bats. The bats must not be disturbed in any way.

    Box Quarry is at the western end of the MOD's Tunnel Quarry site and is partly owned by the MOD but after some modification it was only used as an air inlet for the Tunnel Quarry complex.
  • Primary Network Control Centre

    To the Western end of Tunnel Quarry was an area which was the proposed number 1 district as part of the ammo stores, however due to a severe geological fault this area was never developed by Royal Engineers however the air ministry did make use of it 1943 when they converted it in to South West Control, a military communications centre which opperated up until the 1990s.
  • Central Ammunitions Depot

    CAD is spread over four separate quarries in the Corsham area, Monkton Farleigh Quarry is in part used for secure holding by Wansdyke Security. Tunnel Quarry is still used by the MOD. Ridge Quarry has been abandoned. Eastlays Quarry is a commercial site used for wine storage.

Westwells Quarry
Corsham, Wiltshire, United Kingdom


Sign in or create an account to comment.
Revzo - Digital Content Solutions