Triggered a memory of mine and I went searching for it.
Here is the BBC video on it. Note, this was a planned demolition of a normal built block of flats. No special requirements for the kind of use or for defence against attack.
Then I went and dug this up again. It's 90 minutes long and you may not want to watch all of it, in that case fast forward to 29 minutes and watch to about 60 minutes. You may then want to go back and watch it from the beginning.
Or not...
I had this thought within 48 hours of the incident. Then I thought, "no it would be impossible to hide, there would be far, far too many things which could not be hidden".
It was impossible to hide all right.