Documented sightings reported in 1986.
A JAL 747 captain encountered a walnut-shaped object 'twice the size of an aircraft carrier' over Alaska, tracked on radar; FAA evidence was confiscated by CIA.
Brazil scrambled five fighters to intercept 21 radar targets; the Air Minister held a press conference confirming 'we have technical evidence that something was there.'
A spherical object crashed on Height 611, leaving metallic fragments with anomalous compositions analyzed by Soviet scientists in laboratory settings.