It’s damn near impossible to remove. Most of them are probably dead, but it’s damn near impossible to remove. Most of them are in conduits extending through manhole runs, although there are thousands of miles of direct buried lead coax cables throughout the country.
When we try to remove it, the winch cables usually break when we pull it out with the big trucks, or the cable rips apart. It’s just way too heavy to pull out and the ducts often collapse around those cables over time and there’s no way to pull it out (even with the big chopper trucks). Essentially, you would have to dig up entire duct runs to remove it which would be insanely expensive, time consuming, and would lead to a lot of damaged cables that are in the same duct run.
As the previous poster said, it’s safer to leave it in the ground than remove it.