TR-3B Anti-Gravity Spacecraft
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The TR-3B anti-gravity spacecraft is one of the secret technologies which have been available for a very long time. It uses highly pressured mercury accelerated by nuclear energy to produce a plasma that creates a field of anti-gravity around the ship. Conventional thrusters located at the tips of the craft allow it to perform all manner of rapid high-speed manoeuvres along all three axes.
Source: UFO Research