Safely out of the elevator despite a power failure

So that the elevator still runs despite a power failure: Advantages of a good UPS system

Power failure, the elevator gets stuck halfway up, the passengers are trapped. Sooner or later in the film, one of the passengers opens a hatch on the ceiling of the elevator, climbs up the oil-smeared steel side and pries open the doors to the next floor. A heroic moment, but actually a movie cliché. Because if a building operator has taken proper precautions, the UPS system kicks in and supplies the elevator with the necessary power for a final evacuation trip to the next floor, where everyone can get out safely and without oil stains.

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