Deamage to sewer line

Normally the Cox coax line is only about 6-8 inches below the surface of the ground. I REALLY doubt your sewer line is that shallow. Additionally, your sewer line is 4 to 6 inches in diameter. HAD the cable line been bored through the sewage pipe, you would have had sewage draining through that and causing one heck of a stink. Also, since the cox cable is REALLY small compared to the diameter of a sewage line, I fail to see how it could cause a blockage, without causing leakage in the area of the pipe damage.

Last but not least, before a cable line is run underground, the area gets marked for ALL underground services and pipes prior to running the cable. IF they intersected, the cox cable would have been far above the sewage line, but since the area would have been marked for all underground services, I don't see how this could have happened.