Viktor Grebennikov

Viktor Stepanovich Grebennikov (Виктор Степанович Гребенников) (1927–2001) was a Russian scientist, naturalist and entomologist who claimed to have invented a levitation platform which operated by virtue of insect body parts attached to the underside. Grebennikov wrote detailed accounts of his 1988 discovery, which involved an accident whilst examining chitin shells. He also wrote of his experiencies flying over the Russian countryside in his book titled "My world". The Cavernous Structure Effect (CSE) he discovered is an alleged anti-gravity effect.

Although popular with many readers who dream of unpowered human flight, Grebennikov's work is criticized by scientists. His reports are suspiciously devoid of conclusive proof or public demonstration. He claimed that his camera shutter was jammed during the flights due to a time-warping force-field generated by the secret geometric power of chitin.