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On June 30th 1908 a huge explosion tore through the forest of Tunguska, Siberia. The Truth About Meteors: A Horizon Special, BBC 2013
At approximately 7 a.m. on 30th June 1908 the tranquil Siberian forest of Tunguska was rocked by a deafening earth-shattering explosion. Large trees snapped like tiny twigs as the explosions decimated the dense forest. UFO Files: Russian Roswell, History 2005
Reports suggest that Stalin believed the Tunguska blast was the result of a UFO that had launched some sort of experimental weapon. ibid.
But the most shocking discovery came in the form of radioactive metallic fragments found at the site, debris uncharacteristic of any asteroid or meteor. ibid.
Where were the radioactive fragments from Tunguska taken? ibid.
Turning Night Into Day: Weird Effects of the Tropical Weather. Daily Express 3rd July 1908
In remote central Siberia there was a time when the Tungusk people told strange tales of a giant fireball that split the sky and shook the Earth. They told of a blast of searing wind that knocked down people and whole forests. It happened, they said, on a summer’s morning in the year 1908. Carl Sagan & Ann Druyan, Cosmos: Heaven and Hell, PBS 1980
In 1908 a piece of a comet hit the Earth. ibid.
Right up to the present time we have been investigating certain geophysical and biological effects, which are not observed when normal meteorites fall. In particular, the generic pattern has been violated. This violation is to be seen in certain species of animals and in particular the pine trees. Dr Nikolai Vasilieyev
One eye-witness told me he was riding a stallion when he heard what sounded like cannon shots. When he looked up he saw a body glowing like the sun. Vitaly Voronov, Tunguska historian
We got a large content of hydrogen, which is a typical cosmic element. Then we got quite large amounts of carbon dioxide which in its frozen state seems to make up the heads of comets. We also got a certain quantity of hydro-carbons and methane. This too is very characteristic of the front parts of comets. Professor Alexander Dolgov
Trees were blown outwards by the air blast from a fireball explosion five miles above the Tunguska River in Russia in 1908. Solar Empire: Impact! Discovery 1997
An event in Siberia in Russia over a century ago may give a clue to the scale of destruction caused by a relatively small Near Earth Object. Because the region was so remote after years of political turmoil it was over a decade before the first expedition visited the site ... The Tunguska event devastated a forested area covering more than two thousand square kilometres. It remains the largest impact event on Earth in recent history. Cosmic Collisions: Earth, Discovery 2009
In a region called Tunguska deep in Siberia a huge object crashed in 1908. The force of the blast was 2,000 times the power of the atomic bomb that devastated Hiroshima ... This object left only scorched earth. Unexplained Mysteries
Fragments from Tunguska were first discovered in 1927. ibid.
Tunguska, Siberia, 30th June 1908 ... An explosion up-roots sixty million trees and devastates more than eight hundred square miles of the countryside. Comet Impact: Investigation X, 2009
Covered in ice and snow for eight months of the year Tunguska becomes accessible only in the summer, and turns into a swampy mosquito-infested forest. ibid.
This rare footage shot in the 1920s is the only visual record of the original destruction. Charred trees at the epicentre are still standing. But for hundreds of miles around millions of others are knocked over, all pointing away from the blast site. ibid.
June 30th 1908 7.14 a.m. On the morning of the 30th June 1908 a massive explosion ripped through the sky above the Tunguska River basin. One shaken eye-witness reported that it split the sky in two. Expedition Apocalypse, National Geographic 2010
The blast had knocked down almost eighty million trees over two thousand square kilometres without leaving a trace of what caused it. ibid.
Sandstone, full of quartz: how does a five a half ton rock of sandstone get to the top of a mountain covered entirely by basalt? Fitzmorgan believes it could only have been rocketed here from deep within the Earth, carried by a violent Verneshot two hundred and fifty million years ago. The direct ancestor of the Tunguska explosion. ibid.
Lake Cheko is not like other Siberian lakes; it is unusually deep and unusually steep as if carved by an asteroid ... For Sarah the tree’s message is clear: in 1908 the forest was replaced by a lake. It’s further confirmation that Lake Cheko is an impact crater. ibid.
To the Italians the evidence all adds up: the unusual conical shape of the lake, tree rings, a forest on the lake floor, sediment samples, and the suggestion that a cosmic body lies beneath the lake. They believe it is most likely that in 1908 a massive asteroid vaporised in mid-air; somehow, one small fragment survived the fiery descent to Earth: it’s impact gouged out a crater creating Lake Cheko. ibid.
On June 30th 1908 without warning a massive explosion wiped out over one and a half thousand square kilometres of Siberian forest. Millions of trees were destroyed. Scientists thought it had been caused by an asteroid strike. But then why was there no sign of any kind of impact crater? The answer is that devastation had to be caused by an asteroid attack of a very peculiar kind: scientists call it an air-burst. Horizon: Asteroids – The Good, the Bad and the Ugly, BBC 2010
Tunguska is the only hard evidence we have of a recent impact on planet Earth. So we can look at that and say ... if that was a city underneath there, it would be completely obliterated. Professor Bill McGuire, volcanologist
Shortly after 7 a.m. on June 30th 1908 in the cold blasts of central Siberia near the Tunguska river, farmers, herdsmen and travellers watched in awe as a cylindrical object glowing with blinding white light and a fiery tail streaked across the morning horizon. The object is six to ten kilometres above the ground … At 7.17 it explodes in a tremendous ball of fire. Phenomenon: The Lost Archives: Tunguska: The Russian Roswell, 1998
There is still no consensus among scientists. ibid.
A bizarre explosion devastates an area twice the size of New York but what caused the destruction? Mysteries of the Missing s1e8: Flight of Terror, Discovery 2018
The Tunguska event: in a remote area of Siberia a massive explosion rips through the sky. ibid.
The evidence now indicates that a nuclear explosion may have occurred on Earth as early as 1908. In Search of s3e7 … Siberian Fireball, 1978
A blueish cylindrically shaped object came hurtling in from outer space. It was the morning of June 30th 1908: at precisely 7.17 the object exploded. ibid.
A dirty haze seemed to settle on the horizon following the explosion. ibid.