The falling ladder problem [A ladder fell against a "break glass in emergancy" protected switch, then flipped the switch. Said switch switched the comptuer system over to UPS power which turned out not to be able to handle the load. M] reminded me of something that happened at a facility I was working at in Texas a number of years ago. Disaster planning was taken very seriously and the facility had an emergency diesel generator *and* backup battery supplies to hold the data center up in case the diesel was hard to start.
Except for the dump truck that lost control while descending a rise, left the road and slammed into the adjacent power pole.
The pole broke off at the base and fell onto the generator building, doing grievous damage to the generator. The broken engine cooling & fuel lines added to broken water mains to flood the battery room with a noxious mess (the engine bay had a fuel loss containment system but it was not designed to cope with a water main). Along the way, the fire control system triggered adding to the mayhem.
Needless to say, the data center lost power rather suddenly.
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