In December the New York Times revealed details of a top-secret Department of Defense (DoD) prorgamme to investigate any threat from UFOs that ended in 2012.

The report about the DoD £16 million Advance Aerial Threat Identification Programme (AATIP) also astonishingly claimed that the material, that was said to be “unknown to science” following tests, was stored in buildings modified by a private aerospace company which was paid huge amounts of money by the DoD to research the phenomenon and look after the “metal alloys.”

The AATIP was run by military intelligence official, Luis Elizondo, on the fifth floor of the Pentagon’s C wing.

Mr Elizondo resigned to form UFO research group To The Stars Academy with former Blink 182 singer Tom DeLonge.

The bulk of the money went to Bigelow Aerospace in Las Vegas, run by billionaire US businessman Robert Bigelow, who is also working with NASA to create a new expandable spacecraft.

However, no images have surfaced of the alleged material, nor have any details of where it was found, or any reports of tests carried out on it.

Ralph Blumenthal, one of the reporters who worked on the story, later clarified: "They have, as we reported in the paper, some material from these objects that is being studied so that scientists can find what accounts for their amazing properties, this technology of these objects, whatever they are.

"It's some kind of compound that they don't recognise.

"We printed as much as we were able to verify. Can't go beyond that."

The Pentagon isn't the only one who possesses such metals. To read more, click here.