 The site runs to about and comprises a number of surface structures along with a secure command bunker which is about below ground.The Bunker Design type R3-M2 (R3=Rotor Bunker Design R3 – M2=Including 2 additional mezzanine floors) was first built from 1951–3 and started life as an early warning radar station, part of the ROTOR program.An R3-M2 is a larger version of the standard UK R3 Bunker and RAF Holmpton was the only example of this type of structure in the UK as 1