Nazca Tomb: Steve Mera (pictured) was told that metal allegedly found at Roswell was in the tomb.

British investigators who travelled to Cusco in Peru to try to establish the truth of the "world-altering" claims said they had been told "self-folding foil-like metal" was found inside the tomb in Nazca.

It is said to be similar to a type of aluminium claimed to have been found near the alleged Roswell flying saucer crash site in New Mexico that was said could repair itself if bent.

Yesterday, Express.co.uk revealed a new twist in the mystery - after claims emerged live beings were seen in the tunnels where more than 20 mummified bodies were allegedly found.

Historians and many UFO researchers have branded the three-fingered mummies an audacious hoax.

However, UK-based UFO investigators Steve Mera and Barry Fitzgerald travelled to Peru to try to establish if they could be genuine.

They spoke to members of the Inkari Institute, an archaeological research team in Cusco, Peru, which was allegedly handed the bodies by blackmarket tomb raiders.

The pair have made a video documentary charting their adventure.