"The Texas City disaster was an industrial accident that occurred April 16, 1947, in the Port of Texas City. It was the deadliest industrial accident in U.S. history, and one of the largest non-nuclear explosions. Originating with a mid-morning fire on board the French-registered vessel SS Grandcamp (docked in the port), her cargo of approximately 2,200 tons (approximately 2,100 metric tons) of ammonium nitrate detonated, with the initial blast and subsequent chain-reaction of further fires and explosions in other ships and nearby oil-storage facilities. It killed at least 581 people, including all but one member of the Texas City fire department. The disaster triggered the first ever class action lawsuit against the United States government, under the then-recently enacted Federal Tort Claims Act (FTCA), on behalf of 8,485 victims.
The Grandcamp was a recently re-activated 437-foot-long (133 m) Liberty ship. Originally named the SS Benjamin R. Curtis in Los Angeles in 1942, the ship served in the Pacific theatre and was mothballed in Philadelphia after World War II. In a Cold War gesture, the ship was assigned to the French Line to assist in the rebuilding of Europe. Along with ammonium nitrate -- a very common cargo on the high seas -- it was carrying small arms ammunition, machinery, and bales of sisal twine on the deck. Another ship in the harbor, the SS High Flyer, was docked about 600 feet (200 m) away from the SS Grandcamp. The High Flyer contained an additional 961 short tons (872 metric tons) of ammonium nitrate and 1,800 short tons (1,600 metric tons) of sulfur. The ammonium nitrate in the two ships and fertilizer in the adjacent warehouse was on its way to farmers in Europe. The Grandcamp had arrived from Houston, where the port authority did not permit loading of ammonium nitrate.
The ammonium nitrate, needed either as fertilizer or an explosive, was manufactured in Nebraska and Iowa and shipped to Texas City by rail before being loaded on the Grandcamp. It was manufactured in a patented process, mixed with clay, petrolatum, rosin and paraffin wax to avoid moisture caking. It was also packaged in paper sacks, then transported and stored at temperatures that increased its chemical activity. Longshoremen reported the bags were warm to the touch prior to loading.
On April 16, 1947, around 8:00 a.m. smoke was spotted in the cargo hold of the Grandcamp while she was still moored. Over the next hour, attempts to extinguish the fire or bring it under control failed as a red glow returned after each effort to douse the fire.
Shortly before 9:00 a.m., the captain ordered his men to steam the hold, a firefighting method where steam is piped in to extinguish fires, to preserve the cargo. This was unlikely to be effective, as ammonium nitrate produces its own oxygen, thus neutralizing the extinguishing properties of steam. The steam may have contributed to the fire by converting the ammonium nitrate to nitrous oxide, while augmenting the already intense heat in the ship's hold.
The fire attracted spectators along the shoreline, who believed they were at a safe distance. Eventually, the steam pressure inside the ship blew the hatches open, and yellow-orange smoke billowed out. This color is typical for nitrogen dioxide fumes. The unusual color of the smoke attracted more spectators. Spectators also noted that the water around the docked ship was boiling from the heat, and the splashing water touching the hull was being vaporized into steam. The cargo hold and deck began to bulge as the pressure of the steam increased inside.
At 9:12 a.m., the ammonium nitrate reached an explosive threshold from the combination of heat and pressure. The vessel then detonated, causing great destruction and damage throughout the port. The tremendous blast sent a 15-foot (4.5 m) wave that was detectable nearly 100 miles (160 km) off the Texas shoreline. The blast leveled nearly 1,000 buildings on land. The Grandcamp explosion destroyed the Monsanto Chemical Company plant and resulted in ignition of refineries and chemical tanks on the waterfront. Falling bales of burning twine from the ship's cargo added to the damage while the Grandcamp's anchor was hurled across the city. Two sightseeing airplanes flying nearby had their wings shorn off, forcing them out of the sky. 10 miles (16 km) away, people in Galveston were forced to their knees. People felt the shock 250 miles (400 km) away in Louisiana. The explosion blew almost 6,350 short tons (5,760 metric tons) of the ship's steel into the air, some at supersonic speed. Official casualty estimates came to a total of 567, including all the crewmen who remained aboard the Grandcamp. All but one member of the 28-man Texas City volunteer fire department were killed in the initial explosion on the docks while fighting the shipboard fire. With fires raging throughout Texas City, first responders from other areas were initially unable to reach the site of the disaster.
The first explosion ignited ammonium nitrate in the nearby cargo ship High Flyer. The crews spent hours attempting to cut the High Flyer free from her anchor and other obstacles, without success. After smoke had been pouring from the hold for over five hours, and about 15 hours after the explosions aboard the Grandcamp, the High Flyer exploded, demolishing the nearby SS Wilson B. Keene, killing at least two more and increasing the damage to the port and other ships with more shrapnel and burning material. One of the propellers on the High Flyer was blown off, and subsequently found nearly a mile inland.
The cause of the initial fire on board the Grandcamp was never determined, but it may have been started by a cigarette discarded the previous day, meaning the ship's cargo had been smouldering throughout the night when it was discovered on the morning of the day of the explosion.
The Texas City Disaster is generally considered the worst industrial accident in American history. Witnesses compared the scene to the fairly recent images of the 1943 Air Raid on Bari and the much larger devastation at Nagasaki. Of the dead, 405 were identified and 63 have never been identified. These were placed in a memorial cemetery in the north part of Texas City near Moses Lake. An additional 113 people were classified as missing, for no identifiable parts were ever found. This figure includes firefighters who were aboard Grandcamp when she exploded. There is some speculation that there may have been hundreds more killed but uncounted, including visiting seamen, non-census laborers and their families, and an untold number of travelers. However, there were some survivors as close as 70 feet (21 m) from the dock. The victims' bodies quickly filled the local morgue, and several bodies were laid out in the local high school's gymnasium for identification by loved ones.
More than 5,000 people were injured, with 1,784 admitted to 21 area hospitals. More than 500 homes were destroyed and hundreds damaged, leaving 2,000 homeless. The seaport was destroyed, and many businesses were flattened or burned. Over 1,100 vehicles were damaged and 362 freight cars were obliterated—the property damage was estimated at $100 million ($1.07 billion in today's terms)."
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