This came in handy when that meteor exploded over Chelyabinsk a few years ago. A teacher remembered the training and had everyone hide under desks, and they were spared laceration from the blown-in windows.
In Russia, this kind of training is not a long-gone relic - there's a class in school that's dedicated to survival in various situations, covering all kinds of stuff from emergency first aid to making shelter in the wilds. A subset of that is dealing with anthropogenic disasters, and a subset of that is civil defense. If I remember correctly, we had two hours covering nukes alone - likely targets in the vicinity, what kind of damage to expect where, how to build fallout shelters, when to evacuate etc. So far as I know, this all is still taught in schools there.
In Soviet times, the class was called "preliminary military training", and focused more on that aspect - not quite to the point where they'd shoot things, but it would involve timed field-stripping an AK, for example, and reading military topographic maps.
After 1991, the military aspects were stripped out, although in many schools they turned into an opt-in afterschool "patriot club" or some such. These were the primary source of videos like https://www.youtube.com/watch?v=LrxjYfl05ek.
Recently, they've announced that they'll be reviving the old Soviet format, so it'll become mandatory for all high schoolers again, beginning with the next school year (starting in September, 2023).