Do you know what lies deep below New York's Grand Central Terminal? Almost no one who passes through every day has any idea what is underneath their feet. | For more World's Strangest, visit www.sciencechannel.com/tv-shows/worlds-strangest/#mkcpgn=ytsci1 Catch World's Strangest Tuesdays at 8/7c on Science Channel! Subscribe to Science Channel! | www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. | bit.ly/SCI2YT Download the TestTube app! | testu.be/1ndmmMq