"He found on the ranch "a large area of bright wreckage made up of rubber strips, tinfoil, a rather tough paper and sticks," Brazel said in an article published on July 8, 1947, in the Roswell Daily Record (opens in new tab)."
https://www.livescience.com/roswell-ufo-crash-what-really-happened.html
"AN investigator found ‘indestructible debris not made by human hands’ at the ‘alien’ Roswell crash site, his private journals reveal."
https://www.the-sun.com/news/1953600/roswell-investigator-indestructible-debris-alien-crash-journals-reveal/
"The actual debris was "types of materials which [he] couldn't identify," including wood-like material with "hieroglyphics" on it, which, though flexible, could neither be broken nor burned." https://www.grunge.com/434690/bizarre-details-about-roswell-that-still-dont-make-sense/?utm_campaign=clip
"In an oil tank to insulate the windings and for cooling, and supported internally by wood, or plastic, pipe and fittings, each Tesla transformer looks like a short wider pipe that is moved along a longer, narrower pipe by an insulated non-electric cable handle."
https://fringeenergy.com/nikola-teslas-flying-saucer-electromagnetic-field-lift-experiments-2/
""The hull is best made double, of thin, machinable, slightly flexible ceramic. This becomes a good electrical insulator, has no fire danger, resists any damaging effects of severe heat and cold, and has the hardness of armor, besides being easy for magnetic fields to pass through."
"The inner hull is covered on it's outside by wedge shaped thin metal sheets of copper or aluminum, bonded to the ceramic"
https://nexusnewsfeed.com/article/science-futures/nikola-tesla-s-flying-saucer-electromagnetic-field-lift-experiments/
To resist the incredible temperatures of these velocities a special armor called Victalen was pioneered by SS metallurgists specifically for both the Haunebu and Vril series of disc craft. The Haunebu I had a double hull of Victalen."
http://discaircraft.greyfalcon.us/HAUNEBU.htm