At 7:52 on the morning of Thursday, 8 May 1902, the side of a mountain on the French Caribbean island of Martinique tore open and a cloud of superheated gas and ash, moving at approximately 670 kilometers per hour and burning at roughly 1,000 degrees Celsius, slid down the southwestern flank toward the city of Saint-Pierre on the coast.

The cloud — what volcanologists now call a pyroclastic flow or nuée ardente, the latter term coined a few months later specifically to describe what had just happened — reached the outskirts of the city in less than a minute. It crossed the city in under another minute. The wind it pushed in front of it knocked down stone walls. The heat behind that flattened iron bedsteads and ignited every flammable surface simultaneously. In the harbor, eighteen ships at anchor capsized or burned. In the streets, an estimated 28,000 to 30,000 people died of asphyxiation, internal burns, and incineration within the same two-minute window.

Two of them did not. The first was a laborer named Léon Compère-Léandre, who was at home on the southern edge of the city eating breakfast when the cloud arrived. He felt a single overwhelming gust of hot air, saw his door blow inward, and somehow — by a combination of luck and the thick stone walls of his small house — survived with severe burns. He walked, alone, six kilometers south to the next village to find help. He gave testimony to the French investigators within forty-eight hours. He died of his injuries some weeks later.

The second survivor was in a building made of stone with no windows and one door, that door facing away from the volcano.

Louis-Auguste Cyparis

He was a stevedore, a Black laborer in his late twenties or early thirties (the records disagree), and on the night of 7 May 1902 he was being held in the municipal prison of Saint-Pierre awaiting transfer to a longer-term facility. He had been arrested on 6 May for fighting in a bar. The minor cell where he was held was a windowless stone vault that had originally been built, the prison records noted, for solitary confinement of unruly prisoners. The door faced east, away from the mountain. The walls were a meter thick.

The pyroclastic flow on the morning of 8 May reached the prison along with the rest of the city. Cyparis was burned through the small ventilation grate above his door — severely on the back and legs, less so on the arms and head, almost not at all on the soles of his feet. He was conscious throughout. He could not see what was happening outside, but he could hear it.

He waited in the dark for what he later estimated was four days, calling out periodically. The actual elapsed time was three days. Rescuers picking through the ruins of the prison on the morning of 11 May heard him calling and broke down what was left of the door. They expected to find a body. They found a man.

He was treated at a field hospital in the village of Le Carbet, on the southern coast, and survived. He had no useful information about why he was alive when 30,000 of his fellow citizens were not. He spoke very little about it. The American journalists and scientists who descended on Martinique over the following weeks interviewed him repeatedly. He gave brief, factual answers.

Within a year of the eruption, Cyparis had been signed by the Barnum & Bailey Circus and was being exhibited across the United States as “the man who lived through Doomsday.” The contract specified a small reconstructed cell that he sat in for several hours a day while audiences walked past. He wore a small cap. He showed his scars on request. P. T. Barnum had been dead for eleven years, but the formula his circus had developed for monetizing human curiosities was operating at full strength.

Cyparis toured with Barnum & Bailey, by various accounts, between 1903 and 1929. He died sometime in the early 1930s — the date is not recorded. He was buried in an unmarked grave, possibly in Panama, possibly in the United States, the location now lost. The cell he survived in is still standing on the hill above Saint-Pierre as a tourist attraction. The original door is in the local museum.

The election that killed everyone

The reason 30,000 people were in Saint-Pierre on the morning of 8 May 1902, when by every prudent measure they should have evacuated days earlier, was an election.

Pelée had been showing increasingly violent signs of activity since late April. Ash fell on the city continuously from 2 May. A river of mud and boulders swept down the Roxelane valley on 5 May and buried a sugar refinery on the volcano’s flank, killing 23 workers. The townspeople could see, by 6 May, that the mountain was visibly steaming and that the ash clouds at the summit were growing larger by the hour.

The governor of Martinique, Louis Mouttet, was facing a gubernatorial run-off election scheduled for Sunday, 11 May. His party’s prospects depended on Saint-Pierre — the largest city on the island, the commercial capital, the “Paris of the Caribbean,” and politically the most pro-government district. If voters fled Saint-Pierre to safer ground further south, his party would lose. He arranged for a scientific commission of local intellectuals to study the mountain. The commission, which included no actual volcanologists, met on 7 May and produced a report concluding that there was no immediate danger. The report was published in the local newspaper Les Colonies on the morning of 8 May.

Mouttet had moved himself and his wife to Saint-Pierre on the evening of 7 May, in part to demonstrate confidence and in part to be on hand for the election. They were staying at a hotel one block from the harbor. They died together at 7:53 on the morning of 8 May, along with the local newspaper editor, the chief of police, both candidates’ campaign managers, most of the city’s lawyers and doctors, every member of the scientific commission whose report had appeared that morning, and the typesetter who had set the report.

The official cause of death, in the records prepared in Fort-de-France the following week, was for each individual suffocation by ash and burns. The actual cause is harder to summarize without the political context. The most precise medical reconstruction, by the French volcanologist Alfred Lacroix in his 1904 monograph, concluded that the temperature inside the cloud was high enough to vaporize moisture in the lungs in about a quarter of a second. Death was effectively instantaneous for everyone in the open and within roughly ten seconds for everyone inside a building. The exception was Cyparis, whose cell was so well-built that the cloud could not enter directly, and whose injuries were therefore non-fatal.

The election was held on schedule on Sunday, 11 May. The polling stations in Saint-Pierre were unstaffed because there was no Saint-Pierre. The results from the other communes elected Mouttet’s party.

What remains

The city was not rebuilt on the same site. The ruins were left as they fell. A new Saint-Pierre was constructed slightly to the north over the following decades — a smaller town, never approaching the original’s commercial importance — but the original streets are still visible, walls knocked down to roughly the height of a man, the foundations of houses, the cathedral’s bell tower lying on its side. A small museum, the Musée Vulcanologique Frank Perret, displays artifacts pulled from the ruins: melted bottles, fused coins, the bell of one of the harbour ships warped into an unrecognizable shape, a charred sewing machine.

Cyparis’s cell — cachot Cyparis — is the most photographed object on the island. It is half a meter taller than a man and three steps deep. The door has been replaced; the stone walls are original. A small plaque inside, in French, names the survivor and gives his dates. The dates are wrong by several years. No one knows the correct ones.