The Delancey Underground is a proposed subterranean garden that would occupy the unused subway tunnels sitting under New York City's Lower East Side. The project has been conceptualized and is being pushed by three very different individuals: architect James Ramsey, VP of PopTech Dan Barasch and money manager R. Boykin Curry IV.
Despite all of the backers differing backgrounds, they all share the same goal: turning old subway tunnels into usable public space. The Delancey Project would do just that, using technology to ensure that the park is naturally as well as controlling for temperature and water levels. How the temperature and water levels will be controlled is unknown, but the project already has an innovative answer for how to get sunlight from the street to the subway tunnel in the form of fiber-optic cables. The special cables would channel sunlight from the street above to the park below, capturing the elements necessary for photosynthesis.
If the issue of natural lighting can be solved, then finding a way to control the temperature and water levels should be cake. The men behind the Delancey Underground are currently in talks with the MTA and the local community governing boards about the proposed park. You can check out conceptual images of the Delancey Underground here.