Police Find Cleaning Machine, Residue at Hanwha Aerospace Explosion Site

An explosion at Hanwha Aerospace's Daejeon facility on April 1st, which claimed the lives of five workers and left two injured, is under intense investigation. Police are focusing on the equipment used in the cleaning process of rocket propellant facilities where the blast occurred.

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We confirmed a machine presumed to be for cleaning (propellant manufacturing equipment/tools) at the site. Looking at the accident scene, it seems tools were used when cleaning with the machine was insufficient. Residual substances with an oily, sticky form were also found inside the cleaning machine, and were sent to the National Forensic Service for component analysis.

During a follow-up site inspection, police discovered a "cleaning machine" containing oily, sticky residue, along with an "electric tool." These items were collected for detailed forensic analysis by the National Forensic Service. The workers were reportedly cleaning equipment and tools contaminated with rocket propellant when the explosion suddenly occurred.

Authorities are examining whether the explosion originated inside or outside the cleaning machine, as there were no CCTV cameras within the cleaning room itself. The discovery of the cleaning machine contradicts Hanwha's earlier statement that sludge tanks were used and replaced when full. The investigation also noted the absence of ultrasonic cleaning equipment, despite the room being labeled as a "spray/ultrasonic machine room."

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The cleaning machine's exterior was completely blown apart. Because there is no CCTV inside the cleaning room, we are conducting detailed forensics to determine if the explosion occurred inside or outside the cleaning machine.

In connection with the incident, Hanwha Aerospace's Daejeon facility head and another executive have been booked on charges related to the Serious Accidents Punishment Act and the Occupational Safety and Health Act. Three individuals, including these executives, have been placed on a travel ban.

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There was no cleaning tank, but there was something that appeared to be a water tank in an adjacent room.