20 Historical Events That Started With a Routine Maintenance Job
It Started With A Work Order
Most maintenance jobs begin without much ceremony. A work order gets approved, and a technician arrives to do something routine. But maintenance often requires equipment to be shut down, safeguards to be bypassed, or systems to operate outside their usual conditions. When something goes wrong during that window, an ordinary job can become the starting point of a major disaster. The pattern appears everywhere from nuclear reactors to financial markets. Here are 20 events that began with scheduled work.
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1. Chernobyl, 1986
Reactor 4 was being powered down for a planned outage, and operators ran a safety test on the way to the shutdown. The test called for disabling systems that would otherwise have intervened, and the reactor ended up in a configuration nobody had tried at low power. The explosion came during the procedure meant to prove the plant was safe.
2. The Rosetta Stone, 1799
French soldiers were rebuilding a crumbling Ottoman fort near the town of Rashid when they pulled a slab of granodiorite out of the wall. An officer named Pierre-François Bouchard noticed that the same text appeared to run in three scripts. The stone went to the British Museum in 1802 and has been there since.
3. Piper Alpha, 1988
During maintenance on the Piper Alpha oil platform, workers removed a pressure safety valve from a condensate pump and temporarily covered the opening. When another pump failed, the night shift started the one under repair, unaware that its safety valve was missing. Gas escaped, triggering explosions that killed 167 people in the North Sea.
4. Apollo 13, 1970
Stirring the cryogenic oxygen tanks was ordinary housekeeping, done so the contents wouldn't stratify. One tank had been damaged on the ground years before and its internal wiring was bare. Switching on the stirring fan lit it.
5. Bhopal, 1984
Workers were washing out blocked pipes with water on the night of December 2. Water reached a tank holding methyl isocyanate, and the reaction released a gas cloud over a sleeping city. Thousands died within days and the toll kept climbing for years.
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6. The Mona Lisa Theft, 1911
Vincenzo Peruggia had worked for the firm the Louvre hired to build protective glass cases, including the one around the Mona Lisa. He knew how it came apart. On a Monday morning in August he walked out with the painting under a workman's smock, and the theft is the main reason it's the most famous painting in the world.
7. Three Mile Island, 1979
Workers at Pennsylvania's Three Mile Island nuclear plant were trying to clear a pipe clogged with spent filtering resin. Water apparently leaked into a compressed-air line during the work, causing valves to close and cutting off the water supply to the steam generators. The turbine and reactor shut down automatically, but a pressure-relief valve stuck open, allowing reactor coolant to escape.
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8. Flixborough, 1974
A crack in reactor 5 at the Nypro plant took it out of service for repair. Engineers bridged the gap with a temporary pipe assembled on site, and when it failed the escaping cyclohexane found an ignition source. The blast killed 28 people and flattened the plant.
9. Windsor Castle, 1992
Picture restorers were clearing artworks out of Queen Victoria's Private Chapel ahead of refurbishment work. A tungsten spotlight had been left pressed against an altar curtain, and by late morning on November 20 the curtain was alight. More than a hundred rooms were damaged before the fire was out.
10. Japan Airlines 123, 1985
The aft pressure bulkhead had been repaired seven years earlier, after the aircraft scraped its tail on a runway. The repair used a splice that didn't match the design, and the metal fatigued through thousands of pressurization cycles until the bulkhead gave way in flight. The crash remains the worst single-aircraft accident on record.
11. The AT&T Network Collapse, 1990
On January 15, a single AT&T switch reset itself and announced the fact to its neighbors. A recent software update had left a flaw that turned the announcement into a crash, and the crash propagated. Tens of millions of calls failed over the next nine hours.
12. Windscale, 1957
Graphite in the Windscale piles had to be heated periodically to release stored energy, a procedure considered routine enough to have a schedule. The October anneal went wrong, a second heating was applied, and fuel caught fire inside the core. Milk from farms downwind was poured away for weeks afterward.
13. The Cutty Sark Fire, 2007
An industrial vacuum being used to clear debris from the ship was left switched on over a weekend. Its motor failed early on the Monday, and the fire tore through a conservation project that had already stripped out half the vessel. The Metropolitan Police investigation ruled out arson.
14. Alaska Airlines 261, 2000
The MD-80's jackscrew controls the tail's horizontal stabilizer, helping raise or lower the plane's nose. On Alaska Airlines Flight 261, inadequate lubrication had worn away its threads. The airline had extended maintenance intervals, allowing the damage to go undetected until the mechanism failed over the Pacific, killing all 88 people aboard.
15. The Centralia Mine Fire, 1962
Centralia's borough council decided to tidy up the town dump before Memorial Day, and the method chosen was fire. The dump sat in an abandoned strip mine, and the flames found an opening into the coal seams underneath. Competing accounts of the ignition exist, but David DeKok's research points at the cleanup, and the fire is still burning.
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16. The Roman Baths At Bath, 1878
A leak was draining water out of the King's Bath, and the city surveyor Major Charles Davis went looking for where it went. Pumping out the mud took him down to a lead-lined Roman reservoir sitting over the hot spring, and the digging that followed uncovered the Great Bath. A plumbing problem produced one of the best-preserved Roman sites in Britain.
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17. The SL-1 Reactor, 1961
Three men were reassembling control rod drives at an Army test reactor in Idaho after a shutdown. One rod was pulled further than it should have been and the reactor went prompt critical. All three were killed, in what remains the only fatal reactor accident in American history.
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18. Notre-Dame, 2019
Scaffolding had gone up around the spire that spring for restoration work. Fire broke out on the evening of April 15 and took the roof and the spire before crews stopped it. Investigators never settled on a single cause, though the work site is where it began.
19. Deepwater Horizon, 2010
Before leaving a finished well, a crew runs a negative pressure test to confirm the cement is holding. The test on the Macondo well produced a reading the crew took as a pass. Eleven men died that night and oil ran into the Gulf for months.
20. The CrowdStrike Outage, 2024
Security software gets content updates constantly and almost nobody notices. CrowdStrike sent one on July 19, and Windows machines running it began crashing on boot. Airlines and hospitals spent days recovering, with millions of devices needing a fix applied by hand.
