The gorge at the back of the barrack block. The lower floor like the front has its windows bricked up. Originally to get from the barracks to the magazine tunnel you would have had to step out of the barrack block, into the gorge, then through the doors to the tunnel. To provide a continuous protected area the magazine tunnel was extended into the barrack block by the brick structure shown in the centre of the photo.

Looking south within the main magazine tunnel. The magazine, now converted to the civil defence operations room is on the right. To the left is the telephone exchange. Overhead is the trunking leading towards the camera from the air filtration room, and turning right into the ops room..

The 4 man air lock at the northern end of the magazine tunnel, based on a Naval pattern. Beyond this is the spiral staircase and Victorian ammunition lift, and beyond that the west and east mortar batteries and flanking gallery. The square hole in the wall on the left is a pressure equalisation valve.

The main operations room occupying the northern half of the old magazine. Much of what can be seen here is original, although the layout has been altered for display purposes. The wall map on the extreme left shows all of the ROC monitoring posts in the UK. Above this is the Perspex observation room, which allows an overall view of the Situation Maps on the right wall. The door at the back leads to the original lighting passage and ventilation shaft, which now doubles up as a cable duct.

A teleprinter with a card describing the operating instructions.

Radiation monitors. The cases are made from bakelite and wood.

There are various blackboards indicating the state of play. It dawned on me whilst taking this photo that I could once have been a statistic on this board.

Text and graphical posters (of the before & after kind)  indicating the effects of a thermonuclear detonation at various distances from a built up area.