You can certainly use limpet mines. But, if the Iranians are already essentially providing a naval escort for the ships, wouldn’t it be reasonable to presume they are also defending against a swimmer attack while at anchor as well?
Actually, what I was thinking of was a multi-jet strike using Harpoons (or some equivalent standoff weapon). Like I said in my original post, there is no doubt Israel could deliver a successful attack. There is just this pesky issue of it being an obvious and very overt act of war (because you will have to strike the Iranian escorts to neutralize their AA defences in order to get through to the cargo ship).
Sorry for the double post. Slow link this morning.
Why not make the vessels vanish in a matter of minutes without allowing them even to call for help?
One B2 from Diego Garcia drops 2 X 2000 lb JDAMS per vessel, simultaneously. Apply this for a convoy of more than two ships.
Deniability is not a factor because we’ll be blamed for anything we do or Israel does, anyway.