Comment by razzio

Would it be possible to protect the cables with a 'hook line' before and after the actual cable that is anchored in the seabed (if possible)? Ship anchors would get stuck on the hook line before doing damage. Only needed below the shipping lanes.

If ship anchors are able to reach the sea bottom then it can't be too deep. Drilling fasteners in the sea bottom at shallow depths could be feasible depending on the makeup of the sea bed. No idea about the cost to install vs repair though.