The US military's massive unmanned 'Manta Ray' submarine cleared its first sea test
The Manta Ray, built by defense contractor Northrop ... for reconnaissance and intelligence-gathering missions. In the Middle ...
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US developing 'underwater drones' amid potential threat of war with China
The Manta Ray is designed primarily for intelligence gathering and protecting undersea infrastructure, and can anchor itself to the sea floor and enter a "hibernating" low-power mode ...