As AF412 is preparing to take off, the tower instructs the pilot to "Squawk 3138". The "Squawk" is a four-digit transponder code using only digits in the Octal number system, i.e. 0-7. Therefore it is impossible to "Squawk 3138".
Narrator: This is a UFO - an Unidentified Flying Object. It was photographed at Santa Catalina Island in April of 1966. Look at it again. Closely. Hundreds, even thousands of witnesses have seen similar things appear in the sky. Persons living miles from others have testified independently that UFOs have appeared in a specific place at a specific time.