Had a bit of a strange conversation with an ex-aerospace employee today after I had mentioned my interest in the Rendlesham incident of 1980. They were behaving very strangely but strongly suggested I examine Nick Cook's book "The Hunt for Zero Point".
I've had a quick look at the web and the book seems to cover captured Nazi anti-grav technology. I think I've seen the mentioned somewhere as Aurora and connected to the "Black Triangles".
Interesting and requires further research although my contact suggests I don't follow it up!