The Diefenbunker complex was constructed in the late 1950s when the Cold War was at its height. I remember well the Cuban missile crisis in 1962. There were about 100 people employed here, with scope for over 500 people to shelter from a nuclear blast for a month. The desk shown above is in the President's Office. Thankfully it was never needed, the only president in office who visited the site being Pierre Trudeau.
The site was decommissioned in 1994 and now houses this interesting underground museum on four levels.