The Office of Naval Research's Medium Displacement Unmanned Surface Vehicle experienced three "mechanical or electrical" issues during a transit to Hawaii last fall, requiring a human to board the ship before it reached its destination. The MDUSV, known as Sea Hunter, sailed to Hawaii and back to San Diego, CA with an escort vessel nearby, according to ONR program officer Bob Brizzolara. "One of the challenges with a vessel that's designed to be unmanned -- doesn't have any people on...