CHARLESTON, South Carolina — A pilot safely ejected from a fighter jet because of a “mishap” during a flight Sunday, but officials have been unable to locate the plane.

A news release from Joint Base Charleston and Marine Corps Air Station Beaufort says the pilot of the F-35B Lightning II is from the Marine Fighter Attack Training Squadron 501 with the 2nd Marine Aircraft Wing. USA Today reports that after ejecting, the pilot parachuted into a neighborhood in North Charleston at about 2 p.m.

The pilot was taken to a hospital and was listed in stable condition. A second jet that was flying with the F-35B returned safely to the base, the Post and Courier reports.

However, the news release says emergency response teams are still looking for the other F-35. Authorities have not said what caused the “mishap.” The base is asking for help from the public in locating the missing plane.

The plane’s last known position was near Lake Moultrie and Lake Marion, which are north of Charleston, CNN reports.

The F-35B can cost about $81 million per plane and is part of an overall program that costs $1.7 trillion, the most expensive weapons system in the history of the Department of Defense, according to the U.S. Government Accountability Office.

The program is $183 billion over budget and more than a decade behind schedule, the GAO reports.

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