In forming my previous thought, there was the nagging thought of the costs to Israel for all the work.
Rather than disable the vessels, they should be sold at auction. The costs should be deducted and the remaining proceeds be returned to the previous owners.
I am talking about disabling the engines before they reach port. There are means more subtle and less lethal than those used by North Korea.
Odd, the cables, nets, and other jetsam that float underwater in the Med...