What course of action is taken if the sewer collapses after the cable being installed?

If there’s a break in a bus topology, the nodes that are downstream from the break are cut off from the rest of the network hence with the location of the sewer pipe failure; a temporary jumper cable can be installed above ground to maintain service. The damaged section of pipe is excavated and removed with the fiber cable intact. The damaged section is replaced with split pipe or specially designed repair pipe, connected to the good pipe with a coupling, encased in concrete and backfilled. The temporary jumper cable is removed. In a ring topology, the nodes on both sides of the break will loop the path (self-healing) back towards the ring, so every node is still communicating with each other while the issue is being addressed.