[monkeyshine]

Maybe a drone with a giant pair of scissors. Lol.
Actually I suppose an exploding drone would sever the cable too.

[DannyTN]

Or a drone capable of sensing and following the cable to it's operator.

seems like this would have to be very short range. Fiber optic cable weights 752 kilograms (1757 lbs) per kilometer. Not sure if that weight is for a single strand or an average sized cable with many strands.