View of construction inside the transit hub. (Courtesy Port Authority of NY & NJ)

It looks like construction of Santiago Calatrava’s World Trade Center PATH hub won’t be wrapping up any time soon. Second Avenue Sagas reported that costs are mounting as the project deadline keeps getting extended. The project could now cost an additional $1.8 billion, and take another 18 months as a result of flooding from Hurricane Sandy, which would mean the station wouldn’t open until 2016.

In an interview with The New York Times, Cheryl McKissack Daniel, president and chief executive of McKissack & McKissack, an architecture and construction management company specializing in infrastructure, discussed the cause of the delay. The Port Authority of New York and New Jersey and the Tishman Construction Corporation, however, insist that the transit hub will still be completed by 2015, according to the New York Observer.

View a rendering of the completed station after the jump.