Police and the labour ministry are investigating the incident, which reportedly involved suffocation in a testing chamber.

Authorities in Korea are investigating the deaths of three Hyundai workers in the automaker’s home nation. The engineers were working on a static car inside an environmental testing chamber at the automaker’s Ulsan plant.

Three workers died at a Hyundai car plant on Tuesday, the South Korean automaker told AFP, with local reports suggesting it was an accident during a vehicle performance test. "The three -- two Hyundai researchers and the other affiliated with a subcontractor -- were found collapsed at a test chamber of the plant where they were conducting a car performance test,