On the morning of the 23rd, the death toll from a gas leak accident on the 3rd basement floor of the new construction site of Gasan Metro Knowledge Industry Center in Gasan-dong, Geumcheon-gu, Seoul increased to two.
Two out of four field workers found in cardiac arrest.
The other two are still in critical condition.
Seven other people who were injured are also being treated at the hospital for shortness of breath, etc.
It is known that a total of 17 people were working at the site.
The fire department believes that the suffocation accident occurred when a carbon dioxide pipe burst while performing electrical work on the 3rd basement floor of the construction site.
Carbon dioxide gas leaked from the site is an extinguishing agent used to extinguish fires, and it is known to cause suffocation if it enters the human respiratory tract.
At around 9:10 am, the fire department in charge issued the first stage of response, mobilizing all available manpower, and dispatched 20 firefighting vehicles and 73 firefighters to the scene.
The fire department has finished the search operation and is investigating the exact cause of the accident.