Photos of water rushing into the World Trade Center (WTC) construction site circulated on Twitter and Facebook on Monday night. According to some news accounts, the water was as deep as 30 feet. Contractors are working to pump the sea water out and sources say that, so far, there are no signs of permanent adverse effects. “We are still conducting our assessment, but we've yet to see any structural damage,” says John Gallagher, a spokesperson for Tishman, part of AECOM. The company is construction manager for several of the WTC buildings, including the 104-story One WTC designed by Skidmore Owings and Merrill. Silverstein Properties, developer of four towers at the WTC, reports that no harm has been detected to below-grade mechanical systems and that all of its cranes are in working order.