New York (CNN) — In mid-July at the construction site at 1 Java Street in Brooklyn, New York, the outside temperatures can reach sweltering highs in the 90s. But 500-feet underground, it’s 55 degrees ...

In mid-July at the construction site at 1 Java Street in Brooklyn, New York, the outside temperatures can reach sweltering highs in the 90s. But 500-feet underground, it’s 55 degrees all year round.