Fredrick Valentich Disappearence - October 21, 1978

The Valentich disappearance refers to the disappearance of 20-year-old Frederick Valentich while on a 125-mile (235 km) training flight in a Cessna 182L light aircraft over Bass Strait in Australia on 21 October 1978.

Described as a "flying saucer enthusiast", Valentich radioed Melbourne air traffic control that he was being accompanied by an aircraft about 1,000 feet (300 m) above him, that his engine had begun running roughly, and finally reported, "It's not an aircraft."

There were belated reports of a UFO sighting in Australia on the night of the disappearance, however Associated Press reported that the Department of Transport was skeptical a UFO was behind Valentich's disappearance, and that some of their officials speculated that "Valentich became disorientated and saw his own lights reflected in the water, or lights from a nearby island, while flying upside down.

Valentich radioed Melbourne Flight Service at 7:06 PM to report an unidentified aircraft was following him at 4,500 feet and was told there was no known traffic at that level. Valentich said he could see a large unknown aircraft which appeared to be illuminated by four bright landing lights. He was unable to confirm its type, but said it had passed about 1,000 feet (300 m) overhead and was moving at high speed. Valentich then reported that the aircraft was approaching him from the east and said the other pilot might be purposely toying with him. Valentich said the aircraft was "orbiting" above him and that it had a shiny metal surface and a green light on it. Valentich reported that he was experiencing engine problems. Asked to identify the aircraft, Valentich radioed, "It isn't an aircraft" when his transmission was interrupted by unidentified noise described as being "metallic, scraping sounds" before all contact was lost.
Actual radio transmission of Fredrick Valentich during the incident