Witnesses of the Anchor said that the fire started with a sound that seemed to be popping, and those who barely escaped the scene said that the flames and black smoke spread out in an instant. Fire officials believe that the damage occurred as the toxic smoke spread rapidly across the entire building along with the explosion on the second basement floor.

Reporter Jang Hoon-kyung continues.

<Reporter>

Site workers say that a frozen warehouse was to be built on the second basement level of the warehouse where the fire is believed to have started.


Refrigerated warehouses are mainly insulated with urethane foam, which is a combustible material because thermal insulation and thermal insulation are important.

At the time of the fire, the spray was sprayed with urethane foam, but the fire department believed that there was a fire.

[Seung-Hyun Seo / Chief of Icheon Fire Department, Gyeonggi-do: Since the clothes were burned to the extent that they could not be evacuated, it is estimated that the combustion exploded rapidly as the oil vapor exploded during urethane work.]

Combustible vapor generated by spraying urethane foam spray Experts have filled the enclosed underground space, and experts say that in this situation, even a small burnt fire will explode.

Urethane itself is a material that burns well, and it seems that it would have been more difficult to escape due to the release of toxic gases.

Firefighters estimate that workers who were working underground under the power of the explosion were unable to evacuate and died.

[Yeoinhwan / Construction Technology Institute Fire Safety Institute: Vapor referred to is the possibility that even explosive, rapid speed of fire due to a small spark, because while the combustible gas in the air, the car can be spread -

ground floor The fatalities found in were reported to have been burnt enough to burn all the work clothes.

(Video coverage: Yongwoo Kim, Video editing: Seungjin Lee)