<Anchor> The



Special Investigation Headquarters of the police, which has been investigating the Itaewon disaster, released the final results of its investigation today (the 13th).

On the day of the accident, the police analyzed that as crowds gathered in the narrow alleys of Itaewon, people were unable to move on their own and were swept around.

We would like to tell you in advance that we used the CCTV analysis video provided by the police in the utmost moderation.



This is Reporter Kim Hyung-rae.



<Reporter> It



was 10:11 pm on October 29th, 4 minutes before the disaster.



On the Itaewon World Food Culture Street, crowds of people were tangled and pushed around.



The special edition described this scene as a 'crowd fluidization' phenomenon.



As the crowds were excessively close together, they could not move on their own and swayed in one mass like water.



Three minutes later, the crowds that were caught in this way came to an alley with a maximum slope of 11 degrees and were pushed down at high speed.



From 10:15:24 p.m., people fell over four times in 15 seconds, and an unknown crowd from above continued to push down, resulting in a disaster in which hundreds of people were piled on top of each other.



Enlarge Image


[Son Je-han/Police Itaewon Special Investigation Headquarters: The crowd continued to push behind the people who fell, and they were evangelized sequentially...

.]



As a result of the study, when the number of people per square meter exceeds 7 people, this 'fluidization' phenomenon occurs. has been analyzed as



The force applied per person was estimated to have reached 560 kg in terms of weight.



The two-way traffic of the accident alley and illegal structures were also pointed out as factors that increased the damage.



As a result of the simulation, blockage occurred from 800 people in two-way traffic, but when it was changed to one-way traffic, there was no blockage even for 1,000 people.



Also, when I built an illegal structure like a disaster site, the pressure on people increased up to twice as much.



[Park Joon-young/Professor of Mechanical Design Engineering at Kumoh Institute of Technology: Due to the structure that causes the bottleneck, a large force of about 1,500 N (equivalent to 153 kg) is applied at high density.]



Ultimately, the victims suffer from breathing difficulties and intra-abdominal bleeding due to this pressure .

The special edition concluded that this occurred and led to death.



(Video coverage: Park Hyeon-cheol, video editing: Yoon Tae-ho)