Bruce Schneier notes that a fourth and fifth undersea cable have malfunctioned or been cut.
It’s probably a little early for conspiracy theories but if I did have a midget submarine and I wanted to cause a great deal of trouble, this would be one way to do it. But also, once I’d cut a particular cable once, why stop there? Once the cable is cut, the company has no way of monitoring the status of that segment. So why not cut it five times, at five random points? The company fixes the first break, but the cable still doesn’t work and so they have no way (that I know of; people who lay these things for a living may differ) of telling where the other breaks are. They have to raise or inspect the entire segment, which would take weeks or months. Particularly if you break enough to exhaust the world supply of suitable ships.