For years I have had this idea about a sub-driven drone.
The Sub drop a "thing" in the water and when the sub is far away it activate this thing that turn a this thing into a rocket that shot this drone out of the water and into the sky.
While it is in the air, it can sweep the area with some kind of radar and other things to collect information about enemy warship in that area. This information can be send by wire or wireless to this "thing" that float on the water. I don't know if this "thing" should have some type of wire connected to the sub or not.
Just an idea.
Markus
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