I would like to propose an ultimate stealth submarine design. It would basically mimic giant whales. It will use electro mechanical flukes and flippers to navigate underwater. Such small submarines are already built in laboratories. I guess they can be scaled up.
The main power supply of the submarine will be hydrogen fuel cells. The submarine will carry liquefied hydrogen and oxygen to generate electricity. The byproduct of the fuel cell will be consumed as fresh water on board the sub and the surplus can be ejected into the sea after being cooled down. Therefore, there will be no trace left behind. The sub will also have nuclear batteries to generate electricity as backup power. The surplus power of these batteries will be used to electrolyze the sea water to refill the hydrogen and oxygen tanks.
The submarine will carry smaller bot fishes on board. They will be used to investigate the route ahead. The small fishes will utilize special sonar sensors mimicking the living fish. Due to their smaller size, they will be undisguisable by the enemy. Once a fish finishes its investigation it will return back to the sub and offload its data acquisition.
The sub may not have the range of a nuclear submarine. However, a highly automated system will require less personal and there would be more room for the weapons.
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