well place some military buildings half in the water...and line the top with enemy static ATGM and Static AA launchers, these keep friendly aircraft and boats away....divers can go almost all the way up before they have to pop out of the water to plant the explosives on the half that is out of the water.. then they dive off to a stand off distance before setting the explaosives off
Just dont put many enemy ground troops around these buildings....just spitballing ideas here