Sneaky rich and influential people.

[NorthernRaider]

I'm also led to believe that many corporate and up market residential underground car parks are not always what you think they are, some have strangelt heavy single person doors highly secured that are "" electrical cupboards" and "cleaners cupboards" but often the staff dont have keys for them.

I looked up Londons bellsize tube station on google earth its very good, just on the surface a round white painted old LUL building, with a single door just round the corner, Most Londoners would not give it a second glance but on some images you can make out the vent louvres look like the blast overpresure spring loaded type, and theres a hd steel double door in the carpark tween two chimneys Hmmmm

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Lets not forget many of the 50s and 60s built GPO (as they were) X automated telephone exchanges were built with safe rooms, bunks, supplies and emergency power supplies for engineers to keep important phone lines operations after a nuclear attack.