Ammonium nitrate decomposes at around 350 degrees Fahrenheit. The fire grew. The captain ordered his crew to abandon ship.Firefighters tried spraying the burning ship from the dock. Spectators, including schoolchildren crowded the quayside to watch the action. Bad idea, since the Grandcamp exploded at 9:12 a.m. The captain and 32 of the Grandcamp's crew died; 10 somehow survived. More than 200 people were killed on the quay. The blast was heard 160 miles away. It shattered all the windows in Texas City and half of those in Galveston, 10 miles away.