In the case of the TR-3B Black Manta, it means a craft that uses highly pressured mercury accelerated by nuclear energy, so that plasma is produced, which, in turn, creates a field of anti-gravity ...

Antigravity -- Beyond rocket propulsion -- Onward and upward -- An etheric explanation -- The U.S. antigravity squadron -- Gravity beam propulsion -- Project skyvault -- Microwave phase conjugation -- ...

Near the closing hours of world war two, the nazis started to experiment with more… unconventional aircraft designs. And ...