For a station with as storied a history as Grand Central Terminal, there’s bound to be a few hoaxes or tall tales shared over the years. The best stories always begin with a kernel of truth, to lay a believable foundation to imagine from. In the case of Grand Central’s sub basement, known as M42, a tall tale has sprung a life of its own. Just search for M42 online and you will read stories of a “clandestine” or “top secret” basement that “Hitler tried to destroy.” In reality, most things you’ve heard about M42 are probably false. The fictional...