John Searl was a British inventor who accidently discovered Anti-Gravity using magnets configured in a very special way that only he understood. This occured some time in the late 1940s or early '50s! His site, searleffect.com, is no longer on the net so he must have died quite recently (I am updating this page on the 20th April 2021).
More odd is the fact that Archive.org has the same page going back to the 6th of June 2007. I distinctly remember his site being very much different to what is shown. So his information was so impporant to keep secret that records of his site have been purged. You can find info about his site prior to the 6th June 2007 but it, again, has very little change to when the site was first crawled by the Archive.org 'bots back in 2001. The videos below were obtained from his site a few years ago. You can still find videos of his work and technology on YouTube by typing 'john searl ufos' into the search bar, otherwise you will not get any videos of his work. The current channels that have his videos are here, here and others.
Part 1
Part 2
Part 3
Part 4
Part 5