Nicola Tesla said that he caused the Tunguska incident of 1908 while testing his famous "death ray" which caused a 40 megaton explosion over Siberia. It caused such significant damage that it is evident still today. The blast was so significant that the shock wave from the air alone went clear around the world two times and created noctiluscent or poisonous shimmering clouds in the night sky all over the world. Locals experienced changes in their blood's RH factor and nature has seen genetic changes in flora and fauna.
Tesla was sending millions of volts and thousands of amperes on a single radio wave into the air.
" Such a transmitter would be capable of projecting the force of a nuclear warhead by radio.
Any location in the world could be vaporized at the speed of light." See HERE
Tesla had discovered free, clean and wireless, limitless electrical power that could be sent anywhere in the world if controlled.
Excavations at Tunguska have found no meteorite of any kind nor residue from one is found in the area at all despite the insistence of some that a meteor is the only thing that could account for the huge explosion.
But Tesla said he knew that he had done it when he aimed his generator and fired.
The New York Times of day carried at least 3 articles in which Tesla stated his Wardenclyffe plant could do exactly what happened at Tunguska, and the Soviet Union declared later that their Tesla based experiments produced "cold explosion".
"Tesla revealed that he had carried on negotiations with Prime Minister Chamberlin for the sale of his ray system to Great Britain for $30,000,000 on the basis of his presentation that the device would provide complete protection for the British Isles against any enemy approaching by sea or air, and would provide an offensive weapon to which there was no defense." from Prodigal Genius (a book never published)see reference 10 here
And the New York Times Dec 8,1915 wrote ,
"Nikola Tesla, the inventor, winner of the 1915 Nobel Physics Prize, has filed patent applications on the essential parts of a machine the possibilities of which test a layman's imagination and promise a parallel of Thor's shouting thunderbolts from the sky to punish those who angered the gods. Dr. Tesla insists there is nothing sensational about it, that it is but the fruition of many years of work and study. He is not yet ready to give the details of the engine which he says will render fruitless any military expedition against a country which possesses it. Suffice to say that the destructive invention will go through space with a speed of 300 miles a second, and manless airship without propelling engine or wings, sent by electricity to any desired point on the globe on its errand of destruction, if destruction its manipulator wishes to effect."
Ten miles or a thousand miles, it will be all the same to the machine, the inventor says. Straight to the point, on land or on sea, it will be able to go with precision, delivering a blow that will paralyze or kill, as is desired. A man in a tower on Long Island could shield New York against ships or army by working a lever, if the inventor's anticipations become realizations.
No residue from any meteor is in evidence.
Is there a connection? Well, those who believe that Tesla did cause Tunguska believe there may well be a connection.
In the end , however, no one knows for sure.
There are things that can be explained no other way, but, we do not know for sure.