The technology for creating a working man-made 'saucer' has been around in various forms since the 1950s. However the supression and compartmentalisation of the hardware has meant any that are around are flown as part of covert military programs.
It's been over six years
since Martin Stubbs released his DVD entitled The Secret NASA
Transmission: 'The Smoking Gun'. The DVD contains video footage taken
directly from NASA Space Shuttle broadcasts and seems to show
unidentified flying objects. The footage came from the NASA cable
channel, which automatically videotapes during the "off hours", when
the astronauts are resting and the video cameras mounted on the space
shuttle are pointing into open space or towards Earth
Occasionally the cameras
capture images of objects moving through space, or through the Earth's
upper atmosphere. Some of these images are of objects with amazing
speed and maneuverability.
Release of the footage
created a storm of criticism from NASA and has been debunked by
scientists. Objects pictured in the video were stated as being dust or
ice particles - just as in the case of shuttle mission - STS 48
NASA [or some other body who pressured NASA could be more likely] quickly withdrew unencrypted live feeds once more demonstrating that of course there was something to see in the footage. However recently a few minutes was streamed via NASA's own TV service showing yet more images of the earth's upper atmosphere and yes, it was busy as usual.
This video below was taken from a straight 1min 30secs of feed. The contrast has been enhanced but nothing else. Still images showing the "anomalous" objects have been inserted. We counted 15 distinct [what we presume are] Extra Terrestrial Vehicles or ETVs. For such a short timespan this is amazing. It should also be noted that many objects move too fast for the eye to notice - you occasionally pick up on these after watching the footage a few times.