As workers finished tying down a mangled crane jib left dangling for days over Manhattan's West 57th Street in the wake of Hurricane Sandy, engineers involved in the incident moved to design a method for taking the crane down and replacing it with a rig that can finish a 90-story residential tower under construction there.
Forensic engineers have yet to determine a cause of the Oct. 29 partial collapse, though some theories have emerged. Those probing the incident say they are interested to know why the crane failed while about a dozen others in the city did not. It may take weeks or months before anyone knows for sure, they say.