The P-8 is expected to replace the aging P-3 fleet, which has been in service with South Korea’s navy since 1995. It originally entered U.S. Navy service in 1962 and was designed to detect and track enemy submarines during the Cold War, according to its manufacturer, Lockheed Martin.

A South Korean navy plane has crashed during a training flight, killing all four crew members on board. There were no reports of civilian casualties on the ground.

The plane crashed just six minutes into its flight. No civilians were reported dead or injured. A South Korean navy plane crashed in the southeastern city of Pohang on Thursday, killing all four crew members on board, according to local media. The navy said the cause of the crash was under investigation.