https://sputniknews.com/military/201904141074126022-f-35a-crash-japan-facts/
The top stealth fighter jet disappeared from radars on 9 April during drills 135 km northeast of Misawa city. Japan, joined by some US forces, launched a massive search operation for the wreckage of the jet and its pilot on the same day, but so far little progress has been reported. Search teams have found parts of the plane floating on the surface of the sea, confirming that it crashed, but the precise cause of the incident and the pilot's fate remain a mystery.