Water gushed into the Prudential Center from a leaky pipe on Friday, 21 August 2009, and forced 2,000 people to evacuate the 52-story skyscraper, sending waves of office workers down stairwells and onto the streets of Back Bay. A pipe cracked on the second floor and sent water cascading into a shopping mall on the first floor. The flood disabled many of the tower's elevators, forcing office workers on the upper floors to make a 40-minute climb down the stairs...more