Karen Nix was working at Tulane Medical Center, monitoring the vitals of patients, when the levees failed and Hurricane Katrina flooded New Orleans on August 29, 2005.

By evening the medical center was inundated – into the first floors of buildings. Everyone in the hospital spent the night on upper floors, waiting for their chance to get out. Nix, who usually worked the night shift on the fifth floor, continued to attend to patients. Then the backup generators began to fail.

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