Overview

• The collapse occurred during tunnel reinforcement work on a new rail line connecting Seoul's Yeouido district to Ansan and Siheung in Gyeonggi province.
• An excavator operator is missing, while another worker has been located but remains trapped under rubble.
• The site had been evacuated earlier on Friday due to safety concerns, and a 1 km stretch of road was closed as a precaution.
• Cracks in an underground support column were reported by a site supervisor, prompting concerns about ground subsidence before the collapse.
• Authorities have stated the road closure will remain in place until reinforcement work is completed and the area is deemed safe.