Space is not the only frontier, there is another race going on under the waters - nations are trying to build long range highly autonomous fuel independent submarine drones. Washington has completed the first test of the underwater drone, also capable of hibernating on the seabed.

America's 'Manta Ray': Futuristic new underwater drone, race to conquer the ocean

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America's 'Manta Ray': Futuristic new underwater drone, race to conquer the ocean