LaGuardia Airport is hemmed in by river and roads, so designers must push the limits of a tight site by building as tall as possible. This means a vast 120-foot-long escalator is needed to move passengers between floors.

But the install hangs precariously in the balance. Below ground the team battles to prevent devastating floods, while above, they build a world-first; twin 450-foot-long pedestrian bridges that allow aircraft to pass beneath.

Moving Passengers And Planes: The team races to complete Terminal B in time for the grand opening, while a brutal snowstorm brings the airport to its knees.