Science of Bob Lazar’s UFO Explored

I think what Bob may have been working on was the Betz Sphere. Disappeared via the military in late 70's. Bob was working on a metal sphere he says in the 80's. He said the previous scientist had a fatal accident working on it. Inside the sphere it was proposed that there were heavier elements than at the time known to man. Said if they drilled into it it could maybe trigger a nuclear reaction. That's a lot of harnesable energy to an advanced species. Very fitting puzzle pieces.