I've read a number of articles on this topic, but there's one issue I've never seen addressed: With the large number of cables now in place, often with multiple cables running along similar paths, how great is the risk that in the course of raising up one end of a broken cable, you accidentally snag some other cable that was laid across the first cable after it was laid? Or is the ocean just so vastly, hugely, mind-bogglingly big that hardly any cables cross over each other?