[jester]

Oh so simple!:


Lots of diving here!

Three or four underwater chains or cables just below the waters surface should bottle up that little bay nicely.

Also, cut the moorings of the unmanned barges and vessels. That will keep the people from the maned vessels trying to get close and control them, and prove very difficult for anyone to do anything in the area.

And last,

A boat, or even a bus or large truck, drive either to the narrowest part of the channel the bus will sink when it is run into the channel thus blocking it. A boat will have to be scuttled. The teams make it to the islet and conduct a fighting withdrawl to other vessles on the seaward side that will meet them there and take them out of the area. Like I said most of the operation will be conducted underwater so it will be out of sight and sound.