Renting COTS tunneling machine, digging a plain old and quite unimpressive 1-mile-long tunnel, and calling it something fantastic and extraordinary is a good example of said reality distortion field.

Let's put it in perspective: London is covered by a network of small tunnels dedicated to cart mail around by autonomous vehicles. The tunnels were opened almost a century ago.

https://en.wikipedia.org/wiki/London_Post_Office_Railway