GeoGraph - photograph every grid square

Box Tunnel

This photo shows the eastern portal of Box Tunnel. If you look closely you will see the size of the original entrance, also there is a further reduction in size about 100 feet into the tunnel, this was done so as not to scare people in the 1840's. The secondary entrance on the right takes a railway line into Tunnel Quarry that was started about the same time as Box Tunnel (1836).
Tunnel Quarry was taken over by the War Department during the 1930's and was converted into one of the largest underground ammunition depots in the world (approx 1,250,000 sq ft. of storage space), these tracks run for over a 1/4 of a mile and end in an underground station with 2 platforms each 200 metres long.