A large drone submarine hunter
It is not clear how the ship is maneuvered, but it could be something like the Predator drones where crews in the rear control its movements. It is also unclear how it can avoid being hijacked since there is no crew on board to defend it.
The US Navy's 'ghost hunter' to set sail: 132 foot long robo-boat will scour seas for silent enemy submarines for months at a time - without a single person on board
The first 132 foot long ship, officially named 'The Anti-Submarine Warfare Continuous Trail Unmanned Vessel' will take to the water on April 7th.