If you could build a hybrid uav that also operates as an underwater glider it could be sent out and back from international waters without using shared airspace.
If only the fluid density of water were a bit more like air ;-)
One of the interesting problems with underwater UAVs is navigation, since GPS doesn't work below a few inches of water. So they basically have to come to the surface to know where they are.
If Macboffin's UAV is following my UAV (to see how I'm making money with it) I could just put it underwater until his craft runs low on fuel.And then continue on my mission.
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One of the interesting problems with underwater UAVs is navigation, since GPS doesn't work below a few inches of water. So they basically have to come to the surface to know where they are.