Thomas Mantell was piloting a P-51 Mustang aircraft when flight control told him and his colleagues to investigate an unidentified flying object (UFO) spotted from the ground.
On this day there was an incident that greatly changed the attitude of the American public towards unidentified flying objects. Namely, while these allegations were previously rejected as unfounded, the death of a pilot who claimed that he was following a UFO led the public to seriously consider the possibility of the existence of such aircraft, and even the possibility that they are hostile.
Pilot Thomas Mantell had an extensive flying experience of much as 2,167 hours in the air, and he had also served as a fighter pilot in Normandy during World War II. On this day, many people saw a circular object in the air that approached the ground, and then rose. Mantell was already in the air, piloting the P-51 Mustang aircraft, when flight control told him and his colleagues to investigate the unidentified flying object. They were headed in the direction of the orb, which began to rise. His colleagues gave up the chase at 6,900 meters, but Mantell continued, although he did not have an oxygen mask to breathe at high altitudes.
Having reached 7,600 meters, he apparently lost consciousness and the aircraft begun to fall in a spiral toward the ground and crashed on a farm. To this day, it has remained unexplained what the mentioned circular flying object actually was.