Many years ago I worked for an electronics company in Dallas.
They had a building that they closed down but for the exception of one very high power project and the AC power was available there.
We came in one morning to resume testing but the power was out.
Circuit breakers had kicked and would not reset.
Guy goes up to the roof to check the transformers. Comes back down and says get up on the roof.
There was a conduit that had been cut, fragments of a melted hacksaw, and a pair of soiled bluejeans.
Hey stupid. The building may look empty but the power was still on.