US defence giant Northrop Grumman has tested an underwater drone that looks like a monster manta ray. The drone is capable of carrying multiple payloads of various sizes, and the machine is autonomous and war-ready.

US military flaunts massive unmanned 'Manta Ray'

U.S. defence giant Northrop Grumman has tested an underwater drone that looks like a monster manta ray. The drone is capable of carrying multiple payloads of various sizes, and the machine is autonomous, and war-ready. Gravitas brings you the details of this monster spy drone.

Gravitas | America's new 'Monster Manta Ray' underwater spy drone

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US military flaunts massive unmanned 'Manta Ray'

Gravitas | America's new 'Monster Manta Ray' underwater spy drone