How the site looked in 1955 when it was still very much top secret.The site today:Approach road to the main outer gateMain gate watchtower overlooking the approach roadInternal concrete fence with no man’s land in frontBatch of fifteen fissile core safe houses, this is one of four quadrants of such buildings within the inner pentagon.Watch tower three, there is one at each point of the pentagon positioned on the outer perimeter fence giving a clear view of the approach and no man’s land between outer and inner perimeter fences. Within no man’s land were hundreds of trip wires connected to flares. The outer perimeter fence was patrolled by RAF Police dog handlers who would check in at the towers.Top of the watch towerLooking down at the search ‘Speary’ lightWatch tower four showing the no mans land between outer and inner perimeter fences.This is one of three high explosive storage buildings. This is where the actual bombs minus the fissile cores were stored. The veranda has a heavy duty crane joist underneath so bombs could be lifted from convoys and quickly transferred into the building.Looking at the front of high explosive bomb store 1 with its original blast doorsInside high explosive bomb store 1… still has its original “anti spark” flooring but has now been separated into separate units inside, it would originally have been a single enormous room with no internal walls, only support pillars.High explosive bomb store 1 from the rear to give an idea of scale. All the walls are not bonded to the support pillars, the idea being in the event of an explosion the walls are blown out, collected by the adjacent blast banks and the roof stays on.Watchtower 5One of the 57 Fissile core safe house with the Nuclear sign on the doorThis building is located in the centre of the inner pentagon. It is where plutonium cores were assessed and maintained. The blast wall is to protect the building from explosions in the adjacent high explosive bomb stores, not from within the building itself.A combination lock on one of the 57 fissile core safe housesThe door alarm trigger fitted on every frame of each of the fissle core safe houses. In the event of a door being opened, an alarm would trigger in the guard house. All door opening had to be pre-approved so the guard house knew in advance. If the alarm triggered without prior approval all hell broke loose… dogs, guns etc…External alarm and power system components on each of the fissile safe housesOne of the few complete fissile core safe units concreted within the floor of a safe house. This safe house has two safes in the ground side by side so would not have been used to store plutonium as they could not be kept within close proximity of each other. Most likely these safes would have contained cobalt cores used for testing the plutonium in the building five pics up.