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Move over drones, driverless cars: Unmanned ship up next

It's not only drones and driverless cars that may become the norm someday - ocean-faring ships might also run without captains or crews.

The Pentagon on Monday showed off the world's largest unmanned surface vessel, a self-driving 132-foot ship able to travel up to 10,000 nautical miles on its own to hunt for stealthy submarines and underwater mines.