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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Ghost Shark and Manta Ray: Australia and US unveil undersea drones
Ghost Shark and Manta Ray protect the undersea realm ... specialized equipment for reconnaissance or possibly intelligence gathering. The release said the Pentagon would acquire five more of ...