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Let's review the situation at the time to reveal the cause and responsibility of the accident.

With the help of a video expert, we analyzed the situation just before the accident in Itaewon.

It was found that 16 people were gathered in a small space of 1m in width and 1m2.



This is reporter Jung Gu-hee.



<Reporter> This



is the situation at 10:20 p.m. at the time of the Itaewon disaster.



We reconstructed it in 3D and analyzed it with a video expert.



It was found that 16 people were densely packed in a narrow space of 1m wide and 1m long.



Conservatively, it is judged to be 15 people, and it was analyzed that there are 10 to 15 people per square meter in other areas.



Assuming a height of 165cm and composing it with computer graphics, the maximum number of people who can stand within 1㎡ is 15 people, which is a level that can be achieved only when the feet are intertwined and the body is tightly attached.



[Hwang Min-koo / Director of Forensic Image Analysis Research Institute: Should I say that it is squeezed and stuck?

The posture is so bent that it is impossible to control it, and it is close enough to hug each other.]



Because people have an instinct to avoid things or other people, they make a path avoiding other people when passing through an alley.



A person who cuts in the middle will slow you down and cause congestion, but if you have space, you will find your way again.



However, as the population density increases, the instinct to find the way and individual judgment become useless and become entangled.



A study from the University of North Carolina showed that when there were more than 6 people per square meter, people were unable to move in the direction they wanted and would be stuck in place.



If the density is more than 6 people, it can be dangerous.



The width of the entrance of one road in the alley where the accident occurred was 5.5 m, but the width of the point where the accident was concentrated was narrowed to 3.2 m, making the crowding more serious.



There was no way to avoid danger because crowds flocked to the alleyways and there was no police dispersal measures.



(Video coverage: Kim Won-bae, video editing: Jo Moo-hwan, screen source: German HERMES)