Park Chol-hee was working a holiday shift at Samsung Heavy Industries¡¯ Geoje shipyard on Labor Day in 2017 when a giant crane collided with another and crashed to ground, killing six people, including Park¡¯s younger brother.

¡°It was as if a bomb was dropped,¡± Park said. ¡°Bodies were too damaged to describe.¡±

Park and his brother, Sung-woo, were among nearly 1,500 subcontracted employees ¡ª 90 percent of the shipyard workforce that day ¡ª building an oil and gas platform for the French energy giant Total.