Time for a story....
I had about 45' of 7/8" cable (K60) in a Sanitary line under the parking garage at a hotel I service. Felt the blockage and tried to go back and forth, but eventually I couldn't do either. The cable was stuck in whatever was causing the blockage. I brought in my other K60 to double up , but still couldn't budge the cables. In a moment of panic, I hooked then up to the service truck and put it in drive. The cables stretched like a spring and popped. I now have about 30' lost in the pipe and the blockage hasn't given at all.
Had to put a camera in the line and locate the blockage. Turns out there was a section of grease line from the kitchen that didn't run thru the interceptor. On a 6" line we found a backpitched 45, with about 20" of solid grease, some forks , knives , spoons , a full Mason jar , some ramekins , etc... The cables were entangled in the silverware which was locked into the grease.
We had to cut the floor to remove the cables and repair the backpitch. Also added a floor C/O to the section. They still have not approved me to reroute the grease line to the interceptor. So I'm certain I'll be back in there again some day. That was the only time in 20+ years that I've lost a cable.