On June 30, 1908, at 7 o'clock 14, 5 ± 0, 8 minutes local time in the area of the Podkamennaya Tunguska River, an explosion with a capacity of 40-50 megatons thundered, equivalent to the energy of the most powerful hydrogen bomb. A fireball visible over an area hundreds of kilometers long; powerful thunderclaps; an air wave that circled the globe twice and was recorded by barometers in many countries; finally, a small earthquake noted by a seismograph in Irkutsk - all this indicated the extraordinary nature of the cosmic catastrophe. But the scientific community did not show much interest in this phenomenon. And only almost twenty years after the fall, in 1927, the first researchers who arrived at the site of the fall were discouraged by the picture that opened before them: within a radius of about forty kilometers, all the vegetation was knocked down and burned, and the roots of the trees pointed to the epicenter. In the center stood trees-pillars with cleanly chopped off branches.
But the most interesting thing is that neither this nor subsequent expeditions were able to find even a hint of a meteorite, or even a crater, which, according to all the laws of physics, should have formed at the place of its fall. To this day, there are hundreds of hypotheses about the origin of the Tunguska meteorite, but they remain just guesses.