A Chinese naval ship has captured a $150,000 U.S. underwater drone in the South China Sea. The autonomous underwater vehicle, used to measure ocean conditions and map the ocean floor, was stolen as a U.S. crew watched nearby. In the latest encounter in international waters in the South China Sea region, the USNS Bowditch was sailing about 100 miles off the port at Subic Bay when the incident occurred. The U.S. has lodged a formal diplomatic protest and demanded the return of the drone.