Deep-sea explorers have reported finding two Japanese warships that sank during a major battle in World War II. Explorers and researchers used a robotic underwater vehicle to help with their search in the northern Pacific Ocean. The vehicle is equipped with sonar, which measures sound waves to create images. The team told The Associated Press it discovered a warship after examining sonar images collected from the vehicle on Sunday. The team said it appears the sunken ship is the Japanese aircraft carrier Akagi. The wreckage was found near Midway Atoll, an island about 2,100 kilometers northwest of Hawaii.