I would guess directional boring. They can start a bore and sort of drive it around corners. 20 years ago when they were putting fiber in all over the place he

I would guess directional boring. They can start a bore and sort of drive it around corners. 20 years ago when they were putting fiber in all over the place here, they would bore around a whole cul-de-sac in one go. In several cases breaking every water service line on their way through. https://en.wikipedia.org/wiki/Directional_boring https://en.wikipedia.org/wiki/Directional_boring