Firefighters wrestle with a bulging tank holding 7,000 gallons of methyl methacrylate at a GKN Aerospace site in Garden Grove, California. The chemical’s low boiling point has pushed the tank toward a dangerous pressurization, prompting emergency crews to spray water and deploy sand barriers.

GKN Aerospace, a UK‑based jet‑engine parts supplier, employs 540 staff at the Orange County location. Authorities evacuated 40,000 nearby residents to shelters in Garden Grove, Cypress and Anaheim while experts weigh options to neutralize the volatile liquid.

If the tank ruptures, the released gas could ignite, generating a fireball the size of a house and dispersing toxic fumes over a wide area. Regulators and emergency managers face a tight window to prevent a catastrophic failure that could damage infrastructure and endanger thousands.

The incident underscores the vulnerability of aging chemical storage infrastructure and could prompt stricter safety mandates for industrial plants nationwide.