SEOUL - Seven workers were trapped Thursday in South Korea's subway construction site accident, according to Yonhap news agency.

It was reported to the police at about 1:22 pm local time (0422 GMT) that people were pinned under the collapsed steel bars at the construction site for a new subway line in the capital Seoul.

The accident occurred at a depth of some 80 meters underground.

Among the seven workers buried, one was found in cardiac arrest and was rushed to a hospital.

The police and fire authorities were conducting rescue operations for the remaining workers.