Debris from crashed UFOs was retrieved by secret US Government investigators who tried to rebuild them, claim whistleblowers.
Experts who worked on the Roswell-style retrieval teams were sworn to secrecy.
But at least six have come forward to tell a US Congress probe into reported close encounters of the reverse-engineering work.
READ MORE: Alien life 'more likely to be Terminator-style robots than ET', scientists warn
A law was passed last year allowing anyone who worked on secret UFO programmes to give evidence to an All-domain Anomaly Resolution Office probe, which has told the US Senate it is looking at 650 “sightings”.
Attorney Daniel Sheehan said: “There are half a dozen who have already talked to them.”
Immunologist and Nobel Prize nominee Dr Garry Nolan, who has analysed material allegedly jettisoned in UFO flyovers, said in a podcast: “When you testify, you’re under oath. So these people are putting their careers at risk.’’
A US Defense Department spokesman said it had not found any UFO programmes improperly kept from Congress but its search was ongoing.
Elsewhere in the universe of UFOs, boffs reckon they might have managed to get a message to aliens, but it will take 27 years for a reply to come back.
They think a signal sent to the Pioneer 10 space probe, which was launched in 1972 and is currently 12 billion miles from Earth likely reached a dead star known as a white dwarf 27 light-years away in 2002.
US astronomer Macy Huston, who was not involved in the study, said: "If a response were to be sent our ability to detect it would depend on many factors – how long or often we monitor the star for a response and how long or often the return signal is transmitted.''
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