Three New York entrepreneurs have unveiled plans to turn a long abandoned underground train terminal into a lush and thriving garden. Conceived by architect James Ramsey, VP of the PopTech social innovation network Dan Barasch and money manager R. Boykin Curry IV, the Delancey Underground Project hopes to create New York's first subterranean green space beneath one of the city's least green zones - the Lower East Side - in an unused rail space that stretches over two acres and is nearly the size of Gramercy Park.