Viktor Grebennikov was rumored to have discovered the key to anti-gravity. His technology was forever lost… Or was it?

We have scientifically proven that anti gravity is possible through levitation via sound waves. The same can be said for an electromagnetic field or a force field of any kind. Let’s explore how Viktor Grebennikov achieved that. And what happened to his device?

Many UFOs use the same principle – the structural cavity effect.

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