United States of America (US) Navy on 2 May 2016 tested the world's largest unmanned surface vessel named Sea Hunter in San Diego.
It is a self-driving 132-foot ship able to travel up to 10000 nautical miles on its own to hunt for stealthy submarines and underwater mines.
It is designed to travel thousands of miles out at sea without a single crew member on board.
The Pentagon's research arm, the Defense Advanced Research Projects Agency (Darpa) developed the ship along with Virginia-based Leidos and it will conduct the test in conjunction with US Navy.
Tests will be conducted for the next two years along California's coast to check its ability to react on its own to avoid collisions with seafaring traffic.
Sea Hunter Warship
• The ship is powered by two diesel engines and can reach speeds of 27 knots per hour.
• It is a 132ft-long (40-metre) unarmed prototype ship which is designed to cruise on the ocean's surface without a crew.
• The ship underwent two years of testing which includes verifying that it can safely follow international norms for operating at sea.
• More importantly, it can use radar and cameras to avoid other vessels.
• It is the naval equivalent of Google's self-driving car.
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Where: San Diego
What: Tested by US Navy
When: 2 May 2016