So called crash retrievals
Not that I believe there has been crashed alien craft but I just watched Jesse Michels and Eric Weinstein saying they can't understand why no theoretical physicists are employed by the gov or private aerospace companies to understand and reverse engineer supposed downed/landed/crashed alien craft. Supposedly it's engineers and material scientists who work on them but no top physics people. Well when you think about it what could theoretical physicists do? These craft apparently have no propulsion mechanisms, no controls inside, not even an engine has also been said. So if you have a craft in a hangar and it's floating five feet off the ground, totally silent and if you open it there is no mechanism anywhere to deconstruct, what can a physicist derive from this? Nothing really. So it would be down to engineers and material scientists to investigate the actual metal/substance that it's made from.