This bunker mentality carried on unabated until the end of the cold war and just as in Britain, many of the later bunkers that were under construction as the cold war drew to a close were never completed or commissioned.
Today, the majority of bunkers in West Germany are sealed and no longer accessible but in the east its a different story; there is less money and high unemployment.
This also meant, of course, that it could be stored in artillery shells and bombs.
The four floors differ in plan: Level 1 has a 189 metre long railway tunnel running along, but forming part of its south side, Levels 3 and 4 extend to the west of the higher levels (80 x 30m) and served originally for storage and emergency flooding purposes.
The main core running downwards through the bunker is some 40 x 55m.
We did visit Falkenhagen in 2001 but, considering the size of the complex, the tour was short with little time to take more than a cursory look at the site.
This year we planned to spend two days at Falkenhagen and a further two days looking at new (to us) sites around Berlin.
Under German management, it was to comprise of two separate production facilities, only one of which was subsequently used by the Russians.
This location was chosen, amongst other reasons, due to its reasonable proximity to the Wehrmacht's experimental site and laboratories in Kummersdorf, close to Wnsdorf and lying some 45 km south of Berlin (small quantities of the incendiary agent - see below - were produced initially in Kummersdorf).
At the centre of the complex was a huge four level bunker that was used as the production and storage facility for N-Stoff; the fourth floor being some 15 metres below ground level.
The total bunkered area of the four floors is some 15,600 square metres.
The compound is remarkable for the extraordinary vigour with which it reacts.
It destroys glass and quartz except at low temperature; glass wool catches fire in the vapour immediately.
One such site is Falkenhagen which although still in the hands of the German Property Services Agency is in reality derelict and gradually returning to nature.