The cable is below ground. There are manholes every so often. Just crawl in a manhole and fire at the end of the cable as it enters the manhole. If the cable is encased in a pipe like most are I imagine the bullet could go quite a ways down the pipe ricocheting around tearing things up.

...the company claimed it had received little negative feedback on the issue.

In other words, the email responses didn't make it through M$'s new anti-spam software.