There was a science fiction TV show from the 1960’s called the Time Tunnel in which a massive U.S. government agency was building a time machine, called the Time Tunnel.  The show itself was basically the adventures of two scientists who go back in time to prominent historic events and occasionally forward into the future. 

But the best part of the show was the underground base in which the Time Tunnel was located.  36,000 people worked in the giant underground base in Arizona.  Entering the base was done by going through a Batcave like entrance and then driving into a colossal parkade.  The ground above the base looked like regular desert.  The corridors and walkways in the base crisscrossed over thousand foot high drops. 

This must be one of the best underground bases ever conceived.

Project Tic-Toc is a top secret U.S. government effort to build an experimental time machine, known as “The…