According to rescue officials, the collapse occurred at around 1:20 p.m., and all seven workers were rescued shortly afterward.
Among them, one man in his 50s was found in cardiac arrest and was taken to a nearby hospital, while another man in his 50s suffered a minor ankle injury. A foreign worker in his 30s escaped on his own and was later treated at the scene for an injury to his wrist.
The accident is believed to have occurred about 70 meters underground when the steel bar fell during concrete pouring work.
Police said they plan to investigate whether there were any safety lapses during the work.
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