What Crashed During The Tunguska Event?

The Tunguska River, Russia. At 7.14 in the morning on June 30, 1908, a mysterious, unexplained and deadly event occurred. During which, there was an enormous explosion. It has been estimated that the explosion was equal to more than 2,000 Hiroshima atom bombs, and for over a hundred years, no one has been able to figure out what caused it. At around breakfast time Mr. Semenov was sitting outside his house at Vannevara Trading Post, about 40 miles south of the edge of the explosion, he recalls the event, suddenly seeing directly to the north, over on Kolstunguska Road, the sky split in two. Fire appeared high and wide over the forest. The split in the sky grew larger, and the entire northern side was covered with fire. At that moment, I became so hot that I couldn't bear it, as if my shirt was on fire. From the northern side, where the fire was, came strong heat, I wanted to tear off my shirt and throw it down, but then the sky shut closed, and a strong boom sounded, I was thrown a few meters. I lost my senses for a moment, then my wife ran out and led me to the house. After that such noise came, as if rocks were falling or cannons were firing, the earth shook, and when I was on the ground, I pressed my head down, fearing rocks would land on me. When the sky opened up, hot wind raced between the houses, which left traces in the ground like pathways, and it damaged the crops. This witness testimony was recorded in 1930 by Leonard Kalai's expedition. Although for many years scientists thought it was probably a meteor, the lack of evidence has led to numerous speculations ranging from UFOs to black holes. To this day, no one knows for sure what caused the explosion. During the explosion the fireball that ensued, witnessed by the handful of terrified, distant onlookers, a fireball witnessed as falling from the sky, was later estimated to have been many miles wide. What caused the Tunguska explosion? And most importantly what is buried at the epicenter of the event, or what was left on the earth? Whatever it is, for the past 100 years the only vegetation capable of surviving the location's environment is grass. The sheer force of the event destroyed trees far and wide, near ground zero damages were similar to those registered during atmospheric nuclear tests in the 1950s and 1960s. The trees directly below the explosion were stripped of their bark and snapped flat, while trees farther away were knocked over and uprooted. Interestingly, the explosion's pattern was in the shape of a butterfly. The Tunguska event is the largest impact event ever recorded on earth. Studies have yielded different estimates of the object's size, depending on whether the body was a comet, a denser asteroid, or something else entirely. A team of researchers published analysis results of micro-samples from a peat bog near the center of the affected area showing fragments that may be of meteoritic origin. Whether these fragments have been found to contain alient pollutants has not been disclosed, but the physical evidence at the site would suggest a hostile chemical was released during the event, which even after a hundred years is still having a drastic effect on the landscape. It is estimated that the Tunguska explosion knocked down some 80 million trees over an area of 2,150 square kilometers, and that the shock wave from the blast would have measured 5.0 on the Richter magnitude scale. Whatever it was, this thing was big. Also, there is clearly something that still remains at the location, and it isn't friendly to life.