trust me there are LOTS of hidden tunnels & locked steel doors down there, it's a rat infested rabbit warren where you could get lost & never be seen again!:-):-)
Reminds me of the new Taipei Airport in Taiwan circa 1982? We landed there in an Air Nauru 737 for an overnight. We were transported from one side of the airport to the other side by travelling under the airport. There were hundreds of tanks, guns and other military equipment parked deep underground.