Why are you assuming that would be released publicly? The person you are discussing this with is simply informing you of the existence and availability of the technology you're asking about.
They now the distance to the break from one end. They then use that with a map of the cable to determine the lat and long of the break and send a ship to fix it.
This process assumes the damage is accidental and doesn't involve the military. If Russia keeps cutting optic cables that could change. I can envision military ships getting real-time notification of fiber cuts and the current location of all foreign ships.