The sub-basement of Grand Central Terminal is New York City’s deepest basement, at least that’s what they’ll tell you. It’s also likely the safest and one of the most secure places in all of the 5 boroughs. It was never included on blueprints for the building, and its exact location remains confidential to this day. To make it all the more mysterious, the room is called M-42, which sounds like something straight out of The X-Files.

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