seems they still exist footage in NY Times shape looks could be Vimana https://www.thestar.com/news/world/2017/12/19/something-not-from-the-earth-ex-us-pilot-recalls-ufo-encounter-studied-by-pentagon.html https://www.thestar.com/news/world/2017/12/19/something-not-from-the-earth-ex-us-pilot-recalls-ufo-encounter-studied-by-pentagon.html
