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The Zenith Balloon Tragedy of 1875

On a cold April morning in 1875, three men ascended into the sky above Paris in a balloon, hoping to push the boundaries of human flight. Their journey was a scientific expedition, an attempt to explore the upper atmosphere and venture into a realm where few human beings had ever been. But as their balloon climbed higher, the air grew thinner, the temperature plunged, and the simple act of breathing became a desperate struggle. What began as a daring experiment in the conquest of the skies would end in one of the most horrifying tragedies in the early history of aviation.

Depiction of Théodore Sivel, Gaston Tissandier and Joseph Crocé-Spinelli in Zénith's fatal ascent of 15 April 1875. "La Nature", 1 May 1875

The balloon, named Zénith, carried its crew into a hostile world for which 19th-century science had only begun to prepare. At ground level, the atmosphere seemed limitless. But at altitude, it revealed itself as an unforgiving environment where the human body could fail with terrifying speed. The Zénith expedition exposed the dangers of high-altitude flight, and left behind a grim lesson for generations of aeronauts who dreamed of going higher.

The aeronauts of the Zénith were Gaston Tissandier, a French scientific writer and balloonist; Joseph Crocé-Spinelli, a scientist and journalist; and Théodore Sivel, an experienced sailor and aeronaut.

Gaston Tissandier, born in Paris in 1843, was a scientist, author and enthusiastic aeronaut. He had a particular interest in meteorology and the scientific study of the atmosphere. His brother, Albert Tissandier, was also involved in aeronautics, and the two helped popularise ballooning as a means of scientific investigation.

Joseph Crocé-Spinelli, born in 1845, shared this interest in atmospheric research. He had participated in earlier high-altitude experiments and understood the importance of studying the composition and properties of the air. Théodore Sivel, born in 1834, brought considerable ballooning experience to the expedition. His practical knowledge complemented the scientific interests of his companions. It was under his guidance that Zénith was constructed. 

Barely a month before the fatal flight, Sivel along with zoologist and physiologist Paul Bert, Joseph Crocé-Spinelli, Albert Tissandier, Albert's brother Gaston Tissandier, and Claude Jobert, successfully completed a long-duration flight lasting 24 hours and 40 minutes.

Encouraged by the success of the flight and the positive coverage in the press, the Société Française de Navigation Aérienne (SFNA) announced that it would organize a high-altitude ascent using the aptly named Zénith, a 3,000 cubic meter balloon owned by Sivel.

At approximately 11:35 a.m. on 15 April, Zénith lifted off from the gasworks at La Villette. They carried an array of instruments with them to study the atmosphere, including an aneroid barometer, a hygrometer and an electroscope. They also carried an oxygen-supply apparatus. Three small reservoirs containing a mixture rich in oxygen were attached to the balloon's basket. Rubber tubes and mouthpieces allowed the men to inhale the gas when required.

The crew understood that oxygen deprivation was one of the greatest obstacles to high-altitude ballooning. At lower elevations, the atmosphere supplied sufficient oxygen for normal breathing. As a balloon climbed, however, atmospheric pressure fell, making it increasingly difficult for the lungs to transfer enough oxygen into the bloodstream.

Diagram of the balloon's ascent from Paris to Ciron. Credit: Wikimedia Commons

The men had prepared for the dangers as best they could with the knowledge and technology available. What they could not fully anticipate was how rapidly hypoxia, the condition caused by an inadequate supply of oxygen to the body, could impair their judgement, coordination and consciousness.

By around one o'clock, according to Tissandier's later account, they had passed 5,000 metres. The atmospheric pressure had fallen substantially, and the temperature outside was below freezing. Their instruments were working, and they continued to monitor their physical condition.

As they climbed higher, however, the men began to experience symptoms of oxygen deprivation. At 7,000 meters, Tissandier recorded that Crocé-Spinelli and Sivel had become pale. He himself felt weak and tried inhaling the oxygen they carried, which briefly improved his condition. Sivel then turned to Tissandier and asked whether he would throw out some ballast in order to ascend higher. Tissandier, feeling lethargic because of the altitude and the freezing temperature of −10 Celsius, agreed to the proposal. Sivel proceeded to cut three bags of ballast and the balloon shifted to a quick ascent.

By the time that they reached 7,500 meters, Tissandier could barely move. He described feeling no pain at all, but ‘an inner joy’ and indifference to the increasingly dangerous situation. The lack of oxygen made him delirious. Increasingly debilitated, Tissandier's memory of the events from hereon became even hazier. He remembered trying to reach for the oxygen but unable to lift his arm. Then, looking at the barometer, he saw the pressure at 280 mm and tried to yell out that they had breached 8,000 meters, but the words did not come out from his mouth and he fell inert at about 1.30 p.m.

Sketch depicting Crocé-Spinelli and Sivel, having lost consciousness due to a lack of oxygen, and Tissandier, in the basket of the Zénith on 15 April 1875. Credit: Wikimedia Commons 

At 2.08 p.m., Tissandier woke up and saw the balloon descending at a perilous speed. Gathering all the strength he could muster, he managed to cut off a bag of ballast to re-establish the equilibrium before passing out again. After a while he was shaken awake by Crocé-Spinelli, who asked to throw out even more ballast. Fading in and out, Tissandier saw Crocé-Spinelli throw out the respirator, blankets and more ballast, which caused the balloon to rise again.

Tissandier drifted in and out of consciousness. The effects of oxygen deprivation had left him confused and physically incapacitated, and the sequence of events could only be pieced together from his fragmentary memories.

When he regained consciousness again, the balloon was descending at terrifying speed. He tried to rouse his companions by calling their names and shaking them, but neither man responded. Sivel's face had darkened, and blood was visible around his mouth. Crocé-Spinelli, too, appeared lifeless.

The Zénith finally landed at about 4.00 p.m. in the plains near Ciron, 250 km from Paris. Local residents rushed to help the surviving aeronaut. Tissandier was severely weakened, bruised and suffering from the effects of his ordeal. His companions, however, could not be saved. Both Crocé-Spinelli and Sivel had died during the flight.

The ballloon lands at Ciron. Credit: Wikimedia Commons 

The deaths of Crocé-Spinelli and Sivel raised urgent questions about the safety of high-altitude ballooning. The crew had carried oxygen, understood the dangers of ascending too far and possessed considerable experience. Yet their precautions had proved inadequate.

The central problem was the physiological effect of low atmospheric pressure. At high altitude, the reduced pressure makes it harder for oxygen to pass from the lungs into the blood. The resulting oxygen deprivation can cause headaches, confusion, impaired coordination, loss of consciousness and, in severe cases, death.

One particularly dangerous feature of hypoxia is that it can undermine a person's ability to recognise the danger. Someone who is becoming severely oxygen-deprived may lose the capacity to make sensible decisions or carry out the actions necessary to survive. For balloonists, that could mean being unable to operate oxygen equipment, monitor instruments or manage the balloon's descent.


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The Zénith expedition also demonstrated that carrying oxygen was not enough by itself. The supply had to be accessible and usable under extreme conditions, and the crew had to be able to operate the equipment while suffering the effects of altitude. The ascent showed how quickly a scientific expedition could become an emergency when the human body began to fail.

The exact sequence of events cannot be reconstructed with complete certainty. Tissandier himself acknowledged that he had spent extended periods unconscious and remembered parts of the flight only imperfectly. Nevertheless, his testimony provided a remarkably direct account of the dangers confronting early high-altitude aeronauts.

Tissandier survived, but the loss of his companions was a profound personal blow. He subsequently documented the expedition and its tragic conclusion, helping preserve the details of the flight for other scientists and balloonists. His account remains particularly valuable because it records not merely the instruments' readings but the physical and mental collapse of the men who made them. 

The tomb of Joseph Crocé-Spinelli and Théodore Sivel located in the Père Lachaise Cemetery in Paris. Credit: Wikimedia Commons 

References:
# Patrick Luiz Sullivan De Oliveira. Martyrs made in the sky: the Zénith balloon tragedy and the construction of the French Third Republic's first scientific heroes
# THRILLING ACCOUNT OF A FATAL BALLOON ASCENT. New Zealand Herald, 26 June 1875
# Disastrous Balloon Ascent. Popular Science


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Ukraine says it struck plant making parts for Russian military aircraft engines—a Snizhne factory Russia has used since 2014

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Ukraine's 413th Separate Raid Regiment of the Unmanned Systems Forces struck the Snizhne Machine-Building Plant in occupied Donetsk Oblast in September, working with other Defense Forces units, the regiment posted on 6 October, sharing a video of the strike. The General Staff reported the strike on the plant on 11 September, saying that the extent of the damage was being clarified.

The strike adds to Ukraine's campaign of long-range attacks on Russian military targets as Russia has begun its winter campaign of strikes against Ukraine's energy infrastructure. Hitting the suppliers of aircraft parts goes after Russia's ability to keep its attack jets and helicopters flying.

The regiment said the plant works for Russia's military industry, producing engine components for attack aircraft and combat helicopters.

A former Motor Sich plant in occupied Snizhne

The Snizhne plant was a separate division of Motor Sich, a Ukrainian aircraft-engine maker based in Zaporizhzhia, a city that remains under Ukrainian control. Snizhne has been under Russian occupation since 2014. The plant specializes in producing parts for gas-turbine engines, including compressor and turbine discs and blades, the General Staff said. It never built whole engines. In September 2014, months into the occupation, it was machining blanks from Motor Sich's Zaporizhzhia plant into turbine blades and was one of only two plants in the former Soviet Union making such blades for helicopters, a plant worker said.

Motor Sich said in December 2017 that it had lost control of the plant. Weeks later, Viacheslav Bohuslaiev, then Motor Sich's honorary president and a member of parliament, told RFE/RL's Donbas.Realii that Motor Sich still owned the plant and had handed its management to a foreign company, while keeping it under the company's "full control."

In February 2023, Ukraine's Prosecutor General's Office served Bohuslaiev a notice of suspicion of aiding a terrorist organization, alleging that Motor Sich shipped blanks to the Snizhne plant and received finished engine parts through foreign-registered companies. The case went to court in October 2023, and Bohuslaiev, who denies the charges, has been in pretrial detention since October 2022 as the trial continues.

Snizhne, which Russia uses as a rear base, has been hit before. In May, Ukraine's Unmanned Systems Forces and the Security Service of Ukraine struck a Russian training center for drone pilots in the city, and in September, a strike on energy infrastructure cut power across Snizhne.

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Dubai hostage flight and RAF airbase ‘attack’ were both staged

Western media is a dirty tool of intelligence agencies. War with Iran is coming. Who blinks first?

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The false flag attacks are coming in fast and furious in an attempt to keep both Donald Trump and Bibi Netanyahu in office beyond their normal expiry date. What they really reveal, though, is the extent of how Western media is now a dirty tool of intelligence agencies.

With both leaders of the U.S. and Israel facing an unprecedented challenge to their office, is it not reasonable to assume that both will use their power to indulge in skulduggery and dirty tricks to survive? For Trump, he knows he is facing impeachment if he loses both houses, and I have speculated in earlier articles that he will be looking at unprecedented ways of either calling off the midterm elections or refusing to acknowledge their results – using a pretext of war with Iran. For something, in legal terms, like that to be pulled off, the circumstances would have to be on a scale of Pearl Harbour or 9/11. America would have not only to be at war, but under attack on its own soil for Trump to attempt such a stunt, which many argue isn’t possible in the constitution. But Trump is always breaking rules and pushing the boundaries of what he can do in office, and so it would not be uncharacteristic for him and his legal team to be burning the midnight oil plotting something which is so huge and so significant.

The same story plays out for Benjamin Netanyahu, who is facing seven counts of corruption if his case ever gets heard in Israel. A surefire way of making sure it doesn’t is to keep Israel in a permanent state of war with Iran and to raise the stakes to the point where it appears that this tiny country is under attack.

And so, at the risk of being called a conspiracy theorist, many will assume a false flag attack – or even a series of them – might be coming our way soon, both in Israel and in the West – for the justification of war. Trump’s claims that the U.S. will resume bombing after the midterm elections may well have been a masterly move, when all along he is planning an attack sooner against Iran. To go ahead earlier with a large-scale attack is of course very risky, as, if gas prices go even higher or we see U.S. casualties, this could be a final suicide pill that Trump takes even before Americans go to the polls. But this is a U.S. president who believes he is significantly more intelligent than he really is, and who has fired all the advisers around him who can give him sound advice which would probably not chime with his childish, moronic ideas about what America’s military capability is in the Middle East. Yet it would seem that the plan is to not allow Iran the possibility of a pre-emptive strike.

How else could any cynical analyst interpret two key “attacks” on both Israel and the West recently brought to us dutifully by Western mainstream media? The so-called terror attack on the Dubai flight heading towards Israel is very suspicious, not least of all because Iran issued a warning just a few hours before it happened that a false flag attack was going to take place on a plane, framing Iran. A scuffle in the cockpit which involved a stabbing certainly happened, but the plane spiralling out of control for it to be rescued at the last moment by Israeli pilots who just so happened to be aboard and were able to apprehend the pilot sounds like a really bad Hollywood movie script with B-class actors. The timing is questionable, as is how fast Netanyahu and media were ready to present it to the world as a terror attack.

Just a few days earlier we saw a similar fanciful story in the UK at an RAF airbase where men were arrested under terrorism laws, with Andy Burnham reacting quickly to blame Iran. But where is the evidence? Was Burnham asked to go ahead with a false flag attack by Trump when they met earlier in the month at the UN assembly in New York? The men, although arrested and charged under terrorism laws, were remarkably allowed to walk free on bail. And nothing in their vans, which were parked in woods, has been found which would suggest they were planning any attacks. Were these men set up? Were they paid to do a certain job late at night knowing they were certain to be intercepted? If Iran were behind such fun and games, surely there would not be this level of amateur dramatics.

A more sober take on both the Israeli hostage flight and the UK airbase being a target of terrorism is that they were both staged by the desperate leaders of both the U.S. and Israel in a bid to prepare the Western public for an imminent war which, clearly, the UK will play a considerable role in – despite the window dressing of its foreign minister’s statements about bringing Israel into line on its Gaza genocide (which was also probably a PR ruse).

In many ways this was inevitable, made even more so by the temptation of using Western press as willing partners in crime in a massive, gross misrepresentation of facts to serve a bigger agenda of the elites who own legacy media. A war with Iran is coming on a scale which is certainly going to be greater than the previous “incursions”. The only real question is who blinks first and kicks it off. But the old rules always apply for those who want to seek the truth. In Western media, never believe those who are presented as the culprits, as these usual suspects are nearly always not those who have the finger on the trigger. And in any case, ask yourself: why would Iran need to plan such attacks? What would it gain? The only winners are those who have presented themselves as victims to justify what they are about to do. The lies in the past which we have been presented by both the U.S./UK and of course Israel (which is really the grand master of packing fake news, in particular video) are too great, too exhaustive to ignore. And as long as Western media is happy to play its role, what we are witnessing is what their real role is required to be – given that nearly all of them are loss-making ventures.

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Bailiffs Detain Plane with Passengers in Istanbul

Iranian Airlines Face Chronic Difficulties: On September 30, bailiffs boarded a Caspian Airlines Boeing 737—while passengers sat ready for takeoff—and served an order to collect a debt of 3 million euros before the aircraft could depart. The detention occurred just days after US secondary sanctions against the Iranian aviation sector came into effect, halving international […]

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Project Stargazer: Astronomy From Balloons

For a few hours on a December day in 1962, two men floated at the edge of space beneath a giant balloon, peering into the heavens through a telescope. Their mission, known as Project Stargazer, was an ambitious attempt to turn a high-altitude balloon into an astronomical observatory. Although largely forgotten today, it was one of the most remarkable scientific balloon flights ever undertaken and helped bridge the gap between ground-based astronomy and the space telescopes that would follow.


The Operation Stargazer gondola on display at the National Museum of the United States Air Force. Credit: U.S. Air Force


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Douglas Corrigan's "Wrong Way" Flight to Ireland

When Douglas Corrigan climbed out of his weather-beaten Curtiss Robin at Baldonnel Airfield near Dublin on 18 July 1938, he claimed to have made a simple navigational error. He had departed New York the previous day, supposedly bound for California, yet after twenty-eight hours in the air he found himself on the opposite side of the Atlantic Ocean. Few believed his explanation, but the public loved the story and he earned the nickname “Wrong Way” Corrigan.

The flight was the culmination of a dream that had begun more than a decade earlier, when Charles Augustus Lindbergh’s historic solo crossing of the Atlantic in 1927 inspired a generation of would-be aviators. Corrigan, who had helped build Lindbergh’s Spirit of St. Louis, was among those determined to follow in the famous pilot’s wake, though his own journey to aviation fame would take a far more unconventional route.


Douglass Corrigan stands before his Curtiss Robin that took him across the Atlantic. Credit: History Net


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Tiny Broadwick's Massive Legacy

On June 21, 1913, a tiny woman weighing barely 80 pounds climbed into an airplane over Los Angeles and prepared to do something no woman had ever done before. Suspended outside the aircraft in a small swing-like seat, Georgia Ann “Tiny” Broadwick pulled a release lever and dropped into empty space. Moments later, her parachute blossomed overhead and she drifted safely to earth. With that leap, Tiny Broadwick became the first woman to parachute from an airplane.

Yet this remarkable feat was only one chapter in her extraordinary career. A year later, during a military demonstration, she would help pioneer a technique that evolved into the modern ripcord, forever changing the way parachutists escaped from aircraft.


Broadwick ready to drop from an airplane piloted by Glenn Martin. Credit: Wikimedia Commons


© Amusing Planet, 2026

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