computers in the basement
A place I worked had -- going back to the old IBM 360 days -- the computers in B1 -- first floor just below street level. At the time they apparently thought computers were waterproof. Flash forward several decades, and the servers are much smaller, so the idea is, in case the river -- which was only a quarter mile east of us -- ever overflowed, when the flooding started it'd be all hands on deck, and we'd roll the servers into the elevator and bring them up to the 4th floor where they'd be safe and dry.
And then, someone realized, just in passing, mind you, that the motors for the elevator were in B2.
Finding a way to get the servers up the stairs was briefly considered.