In order to have my computers in a rack in the basement, I needed a way to run cables directly from my desk (in the living room) to the basement. After considering the alternatives, I contracted for a "microtunnel" to be dug hydraulically. It leads from the basement, where the rack will be, to the root cellar which is directly under my desk.
The length of the tunnel is about 6 meters.
In this picture, you can see the "mole" as it gradually rams its way into the clay. Of course, what you don't see is the infernal racket it made, nor do you feel the whole house shaking.
In it goes.
And out the other side.