It is truly amazing that no video of any pre 1975 bunker alert is available. Of course technology now allows dissemination of videos, not then, I was there and got no advice n secret knocks, bunkers etc.
Back in the 70's they used to have demonstrations on the platform on how to get the preaching work done once we were under ban. I remember the sisters pulling out scarves and sunglasses etc brothers wearing different hats and coats and switching them up as they worked the neighborhood. The old ladies in the audience lapped it up...one of them raised her hand and told everyone of a certain dish soap she used that had a plastic container that once empty, was perfect for placing watchtowers and and awakes in so they could be buried in her back yard for use when we were under ban.
People loved the drama of it....it broke up the monotony of their otherwise humdrum lives. That old sister died about 30 years ago and I wonder if anyone has ever dug up her magazines.