It has been five days since worker A from POSCO E&C went missing in a collapse accident that occurred on the 11th at an underground tunnel construction site of the Shin-Ansan Line in Gwangmyeong, Gyeonggi Province. The fire department is conducting stabilization work using excavators and has deployed rescue teams to search for the missing person. A was last seen near a container that is now filled with soil, making it difficult to inspect the interior. The fire department plans to secure a safe entry route and conduct an active search using a small crane.