SAN DIEGO — Part trimaran and part robot, this odd-shaped ship is an unusual fit at the naval pier. What’s even more unusual is this self-driving vessel is designed to travel thousands of miles through the ocean and conduct its mission without a single crew member on board.

At 132-feet long, the Sea Hunter is a prototype of the largest unmanned ship in the world and Navy officials are now looking at the sea drone’s potential to revolutionize fleet operations.

It is light, relatively cheap as far as warships go and can get to places that until now required human exposure, making it an appealing option for risky missions such as trailing a submarine or probing for mines at sea. And, with a price tag of $23 million for the prototype, it was far more expendable than a $1 billion battleship.

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