5. Water bombs
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Navies can set up water bomb systems easily but removing the bombs is really troublesome. They are invisible to the reaction networks because they are made of iron which can reflect indicating lasers.
Also, they can still work after a long tome and the effect is very good. Therefore, they are mainly used to fight warships. With the advanced technology, different bombs can be mixed together.
Because the influenced areas are mainly large, warship groups can be attacked very easily, including aircraft carriers. The attack would be much larger if there¡¦re many warships in the same area, especially the aircraft carrier. They have many warships to give protection to it. It¡¦s really a big problem.