On June 30, 1908, at 7:17 local time, a massive explosion rocked the Podkamennaya Tunguska river region in Siberia. The blast, estimated to be up to a thousand times more powerful than the Hiroshima atomic bomb, flattened around 80 million trees over an area of 2,150 km², yet it did not leave a crater. This absence of a crater has puzzled scientists for decades, as such a powerful explosion would typically be expected to leave a significant impact site. Eyewitness accounts provide a glimpse into the event's intensity. S.B. Semenov described a "true crack in the sky" and a burning heat felt at a distance. The shockwave shattered windows and knocked people off their feet. Luchetkan, an indigenous Tungus person, reported that many reindeer had died, some found carbonized, others missing. Fortunately, the region's low population density limited the human toll to just three deaths. The first scientific expedition did not reach the site until 1927, nearly twenty years after the event. This delay was due to the extreme geographical remoteness of the Siberian region, compounded by World War I and the Russian Revolution, which hindered any exploration missions. It was finally the Soviet mineralogist Leonid A. Kulik who led the first field expeditions. Upon arriving, Kulik and his team observed the forest flattened over kilometers, remaining in its chaotic state for two decades. The absence of a crater is explained by the theory that the explosion was caused by an asteroid that detonated directly in the atmosphere, releasing its energy in the form of a shockwave rather than an impact on the ground. This theory is supported by the radial pattern of fallen trees, which suggests the explosion occurred above the ground. Other theories have been proposed over the years, but the aerial explosion remains the most favored explanation. The Tunguska event remains a significant reference in discussions about the risks posed by celestial objects to Earth. It highlights the potential for powerful explosions without visible craters, a detail that complicated understanding for researchers in the past. The event also underscores the importance of monitoring the skies, as an occurrence of such magnitude over a densely populated area could have had far more severe consequences. Despite over a century of study, the Tunguska event continues to raise questions about our preparedness for such threats.