Rescue workers have retrieved the bodies of all six workers who went missing at a flooded underground waterworks construction site in Seoul, firefighting authorities said Thursday.

The authorities said they found bodies of one of the six missing workers early Wednesday and the remaining five late Wednesday night. Half of the six were South Koreans with the remainder Chinese.

On Monday night, water from the swollen Han River swamped the construction site, killing one worker and leaving six others unaccounted for. The ill-fated workers were removing old water pipes inside a tunnel 25 meters below ground at the time of the flooding.

Heavy rains have battered mostly northern parts of South Korea in recent days, including Seoul and surrounding Gyeonggi Province, killing three other people and displacing 200 others. (Yonhap News)