I'm not going to lie and say this isn't really just a boring cable-laying robot, but the entire system is pretty cool. You've got this snake-machine with on-board cable stays that moves through live, but clean, sewer pipes. Every meter or so, it releases a spring-loaded ring and then another robot comes by to place the cable. It can fit fiber into pipes from 9 inches to about 3 feet in diameter.
We even got to see it go back and forth inside a tube, which was slightly disturbing.
Product Page [Ka-Te]