Four people including three engineers have died in a gas leak at a sewage tank at the Hyundai car factory in Irrun-gatu-kottai near Chennai. As a worker was trying to repair a defective motor of a new sewage treatment plant, poisonous gases left him unconscious. As three other workers of Thermax Ltd, a firm outsourced by Hyundai for this work, tried to rescue him, they too met with the same fate. All of them reportedly died on the spot due to asphyxiation.