In 1915, the Industrial Alcohol Company rushed the construction of a massive steel tank in Boston to store 2. 3 million gallons of molasses. Intended to be converted into industrial alcohol for World War I munitions, the tank was built with thin, brittle steel plates and undersized rivets.
The company prioritized speed and profit over structural integrity, skipping crucial safety tests like filling the tank with water to check for leaks. Almost immediately, locals noticed molasses weeping through the seams. Rather than repairing the structure, the company painted the exterior brown to hide the visible leaks.
On January 15, 1919, warmer air increased internal pressure caused by fermentation inside the uninsulated steel tank. At around 12:40 PM, the structural stress reached a breaking point. The tank collapsed violently, releasing a 25-foot wave of dense liquid moving at 35 miles per hour.
The immense weight wiped out entire city blocks, overturned streetcars, and trapped victims like quicksand. Subsequent legal investigations and landmark lawsuits revealed that the steel was less than half as thick as modern safety standards dictated, marking one of the first times corporate oversight and civil engineering negligence were held strictly accountable in American legal history.