This mystery is only a mystery because the so called scientists do not Know what a comet is. I Know what it is not a dirty snow ball off dust and ice thats about 20years old thinking. First scientists need to take on board new evidence about what a comet is then may be the mystery will not be a mystery any more.

I once read that the Tunguska River event, in 1908, could've been caused by some experiments made by Nikola Tesla.

Tesla's electricity ray is one of the most formidable theories for this. How can it be a celestial impact or a generated WHEN THERE'S NO CRATER?! Tesla announced such an event, trekkers in the pole recorded seeing 'beam of light' at the time and then there was the damage.............. oh but people say it isn't possible to generate that much electricity and the dates were a day different than what Tesla said his beam was to be. Umm, A SINGLE DAY DIFFERENT?????????????????????? Umm.......................... how about a mistake in timing.

I thought this had been proven to be the work of Tesla, some time back. So, what's the mystery. Tesla created a fireball of electricity, misjudged it's trajectory and destroyed Siberia. I really don't see a mystery in it.

Peeerhaps Tesla had a grudge against someone from his childhood and got the spelling wrong when he programmed his subionishpere photon amplifier relay device.  Serbia/Siberia?  Pretty close.  His spelling and geographical knowledge could have gone to hell once he arrived in america.  I'm sure he fit in better as a result.