In the worst accident in the history of the Indian Space Research Organization (ISRO), an explosion ripped through the Solid Propellant Rocket Booster Plant in Satish Dhawan Space Center this week, killing six workers.

The site is the main launch complex of ISRO. An official told Space news that the accident occurred while a test propellant segment was being prepared for transportation after curing.

The propellant caught fire and caused severe damage to the building. The plant makes all the solid fuel needed for rocket boosters.