spectabilis – The complex under Brum, (baring MOD installations under London that we were not allowed to go in), was the biggest we saw in the UK.
There was litterally a village down there sealed from the world above, living spaces, sports halls, power stations, cinema, hospital, stores… etc..etc. Main entrances around the bullring and was on numerous levels and extended for miles in all directions. Further accesses along and at the extremeties of the tunnels.
We refurbished the upper levels for BT to use as storage and cable routing.
We refurbished some tunnels in London and in one particular installation, one of our boys found a door along the tunnel and on opening to investigate was confronted by an armed soldier and a whole pile of doodoo hitting a fan when he came back to the surface 😆