Donna Hare claims to have worked for computer and engineering contractor Philco Ford during the early 1970s, in NASA's photo labs on and off the site of the group's HQ.

Ms Hare claims to have had a high level of security clearance and was able to access parts of the building known as 'Building Eight', which "gave her contact with a series of high ranking officials who leaked her information in secret over lunch".

She claims in a video testimony to have learnt NASA officials who wanted to speak out about the existence of UFOs were threatened with the loss of their pensions and forced to sign gagging orders.

She even alleged one of her contacts who leaked her information had "disappeared off the face of the Earth".

But the most outlandish claim made by Ms Hare was she was informed by sources that during one of the moon landings astronauts had found three UFOs had landed there when they touched down.

She said one contact worked in a quarantine area where landing astronauts were debriefed after they returned home.

She said: "This man was in quarantine with them and was part of their debriefing.

"He said a lot of then talked about their experience of these crafts following them.