Bunkers were a big deal back in the '50s and '60s.
Back in the '80s we had no further (reasonable) use for them as either emergency government or telecomm sites. As structures they had, as I recall, some distinct maintenance cost advantages over convention, above ground buildings. There was the big one a Carp* and several (five?) in places from Comox, BC to Debert Nova Scotia â “ also, I think, at Penhold, AB, Borden, ON, ValCarteir, QC.
They morphed over the years into fairly modern, efficient (cost effective, anyway) telcomm centres â “ the signals people appeared to hate them but we, the plans and requirements staffs, who were always on the lookout for money, were loath to replace them and the construction engineers agreed with us.
Whatever happened to them all? Are the ones in e.g. Borden still there? They were supposed to be hard to destroy.
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* Trivia which I hope I have remembered correctly. There was a teletype message relay machine in Carp which was the very first working computer in the Canadian Forces - Army, back then. It was full of vacuum tubes - heat dissipation was a real problem, I guess. Anyway it predated SAGE/BUIC by several years. It was one of a pair; the other was landing aircraft in the UK as the world's first automated airport terminal control (I hope that's the right phrase) system. Most senior people, including the CDS and cabinet ministers, were to sleep two to a room, on typical army barrack room bunk beds. The PM, GG and, oddly enough, Governor of the Bank of Canada got single rooms.