Cable tracks were in the ceiling, and the flood came within inches of reaching these. All underwater connections had to be reworked, including hubs and switches.
Personal safety is always the first consideration in a disaster so the building was evacuated.
The second consideration is powering-off the computers. The DRT member for technology, a campus security officer and a facilities person did this. Limited backup power supplies were available, and they were in use because the electricity had already been cut off. A viable disaster plan depends on a library's own risk assessment. This disaster was beyond the scope of the original plan.