At approximately 2 p.m. on the afternoon of December 11, 1932, a worker at the Macgillicuddy plant accidentally closed a steam escape valve that should have never been closed except during maintenance on the boilers. Tremendous pressure built up inside Boiler No. 2, and within seconds the powerful coal-fired boiler exploded, collapsing the scaffold above it that supported the main molasses refining tank. The tank, loosed of its moorings, tipped sideways and crashed into the east wall of the plant, shattering through the bricks and dumping its full contents--2,000,000 gallons of boiling molasses--onto Main Street.