Here's my startup thesis for this space, free for anyone who wants it

1. Most delays in tunneling projects are due to elongated decision making processes 2. The majority of the cost of the machines are their initial construction, not operation or maintenance

Solution: fleet of TBMS are set off in arbitrary directions that bounce off the city borders like the screen saver with the bouncing ball. This creates a large network of tunnels all across the city. When it comes time to decide to put new infrastructure in, one of these tunnels is already there somewhere close, just have to dig down to it. 0 decision fatigue/cost, max efficiency for cost per tunnel foot.