A chemical tank at a Washington state paper mill was found unfit for service 10 months before it failed, killing 11 people in what is now one of the deadliest U.S. Workplace disasters in recent decades. Federal investigators revealed the tank had been flagged as unsafe during an inspection, yet it remained in use. The incident occurred in May, leading to a catastrophic failure that resulted in multiple fatalities. The U.S. Chemical Safety Board is examining the circumstances surrounding the tank’s operation and the oversight that allowed it to remain in service. The report highlights potential lapses in safety protocols and regulatory compliance. Authorities are now reviewing the case to determine if additional measures could have prevented the tragedy. The findings may influence future safety standards for industrial equipment.