Here is the documentary; just copy and paste it into the youtube browser. If you have the correct clip it is 39:03 long.
Declassified UFO Documents from the CIA Archives [FULL VIDEO]
The exciting bit happens at 7:18 when a saucer shaped object appears and disappears behind the two guys who are apparently digging at Tunguska.
Maybe some of you image wizards can do more with the enhancing?
Edited by zoser, 15 August 2013 - 05:36 PM.