The U.S. government admitted on Monday that it has “lost” a very, very expensive jet after it slipped off a moving aircraft carrier last week.

The warplane, a US Navy F/A-18 Super Hornet fighter jet, somehow tumbled off the USS Harry S. Truman after the ship reportedly came under fire from Houthi rebels. The carrier has been deployed in the region for months as part of the U.S. effort to deter activity by the Yemen-based fighters, the Associated Press reports.

“The F/A-18E was actively under tow in the hangar bay when the move crew lost control of the aircraft. The aircraft and tow tractor were lost overboard,” a U.S. Navy statement says. “Sailors towing the aircraft took immediate action to move clear of the aircraft before it fell overboard. An investigation is underway.” After falling off the ship, the plane, as planes are wont to do, promptly sank, another official told CNN.