Visited as a group on saturday 5th april.
RAF Holmpton is an amazing place, From the outside what looks like a bungalow leads to a huge underground 2 storey building.
It was built in 1953 and they had to dig a pit 100ft deep to put in the underground bunker. It has walls 10ft thick and tungsten strengthened, and sits on a gravel shockbed.
As far as i know it could withstand a near miss but not a direct hit from a warhead (correct me if anythings wrong). It was designed to operate with the personnel underground and protected for up to 3 months.
Anyway, heres my pictures:
Layout (some of the retained rooms are now open to view):