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Space exploration comes with extreme hazards, demanding a level of courage that could be described as nearly insane. (This is what makes astronauts so fascinating.) While we’re all familiar with major incidents like the Challenger explosion and Apollo 13’s near disaster, there are even more peculiar and chilling accidents lurking in their shadows. These overlooked space missions serve as a reminder of the immense risks astronauts face.
10. Voskhod’s Deadly Decompression
On March 18, 1965, the Soviet spacecraft Voskhod 2 launched into Earth's orbit on a groundbreaking mission: humanity’s first-ever spacewalk. Cosmonauts Alexei Leonov and Pavel Belyayev piloted the cramped, two-person capsule, which had been hastily constructed to outpace the United States. The mission faced numerous technical failures, but the most dangerous one wasn’t caused by the spacecraft—it stemmed from Leonov’s spacesuit.
Just moments after taking his historic walk, Leonov sensed something was wrong. As soon as he ventured into the vacuum of space, his pressurized suit started to balloon. His hands slipped out of the gloves, making any precise movements nearly impossible. To make matters worse, his swollen suit was too large to fit back through the airlock, trapping him outside the spacecraft. In a panic, he released his oxygen, coming perilously close to suffocating, until he managed to squeeze back inside. Fortunately, Leonov survived, providing us with a critical lesson on spacesuit design.
9. Mir’s Space Collision
In June 1997, an unmanned Progress resupply spacecraft was attempting to dock with the Mir space station. Vasily Tsibliev, aboard Mir, had taken remote control of the Progress, guiding it via a live camera feed. Unfortunately, TV screens lack proper depth perception, and Tsibliev only realized too late that the ship was approaching far too quickly.
The Progress crashed into Mir, damaging a solar array and creating a breach in the station's hull. This collision sent the station spinning uncontrollably, and oxygen began to leak rapidly. Fortunately, astronaut Michael Foale managed to determine the station's orientation by observing the stars, and he relayed the information to ground control, who remotely activated Mir's thrusters to regain stability. To contain the oxygen leak, the damaged section was sealed off from the rest of the station.
8. The Lethal Isolation Capsule
A frequently used test for aspiring astronauts is the sensory deprivation chamber. Designed to replicate the profound isolation of space, candidates are confined to the chamber for several days, exposed to minimal external stimuli. It’s uncomfortable but generally safe... unless you're Valentin Bondarenko in March 1961.
Valentin Bondarenko, a 24-year-old cosmonaut-in-training, had just completed his ten-day stint in the so-called 'Chamber of Silence.' The small room, pressurized with pure oxygen to simulate the atmosphere of a Russian spacecraft, began to lose pressure as Bondarenko was about to leave. While using an alcohol-soaked pad to remove medical adhesive from his body, he carelessly discarded it, and it landed on his hotplate, igniting a fire. The oxygen-rich environment caused the room to erupt in flames, burning Bondarenko alive. His burns were too severe to treat, and he passed away eight hours later.
7. Who Says Lightning Can’t Strike Twice?
On November 14, 1969, ominous clouds loomed over Florida’s Kennedy Space Center as Apollo 12 prepared for its scheduled launch. Despite some concerns about the weather, officials decided to proceed as planned, confident that the conditions wouldn’t impact the mission. However, just 36 seconds after liftoff, they began to reconsider.
A lightning bolt struck the ascending spacecraft, sending a shock through the astronauts and disabling most of the electronics on board. As they scrambled to troubleshoot the issue, another lightning strike hit, knocking out the remaining systems. Suddenly, the astronauts found themselves miles above Earth, trapped in a completely paralyzed ship.
In desperation, they reached out to Mission Control for guidance, and a young engineer quickly identified the solution with the flip of an obscure switch. Power was immediately restored, and the mission proceeded smoothly from that point. That engineer, John Aaron, would go on to play a key role in saving Apollo 13 and eventually become the manager of the International Space Station.
6. A Truly Frightening Experiment
In the early 1960s, the United States was racing through a series of space technology tests, aiming to outpace Russia and secure a place in the history books. One of these trials involved test pilots Malcolm Ross and Victor Prather, who donned prototype spacesuits and rode high-altitude balloons into the upper atmosphere to assess the suits' performance.
The test itself went relatively smoothly, with only a few minor issues. It wasn’t until their return to Earth that disaster struck. After landing in the Gulf of Mexico, the two pilots anxiously awaited the helicopter that would lift them to safety. When it arrived and lowered its cables to hoist them up, Prather lost his grip. He fell into the Gulf, and water rushed into his suit. Tragically, he was pulled under and drowned before divers could reach him.
5. The Gemini Jet Crash
The US’s Gemini missions played a key role in refining techniques that would ultimately enable the Apollo missions to reach the Moon. However, few are aware of how close these missions came to being derailed by a freak accident in February 1966.
Gemini astronauts Elliot See and Charlie Bassett were aboard a T-38 Talon, accompanied by their backups, Tom Stafford and Gene Cernan, who were in another aircraft. They were en route to the McDonnell plant in St. Louis, where the Gemini IX and X spacecraft were being built, for a simulator training session. However, the weather in the area was poor, with low visibility, making the landing difficult.
While Stafford and Cernan circled to find a better angle for landing, See and Bassett headed directly for the runway. Unfortunately, the airfield was dangerously close to the factory, and in the fog, See’s jet crashed into the very building where the two Gemini spacecraft were under construction. Tragically, both astronauts lost their lives, but remarkably, the spacecraft—and the Gemini program—continued on.
4. The Apollo-Soyuz Gas Chamber
On July 17, 1975, a US Apollo spacecraft and a Russian Soyuz spacecraft successfully docked in a symbol of international space cooperation. Both teams exchanged pleasantries and gave each other tours of their respective spacecraft. Everything proceeded according to plan... until Apollo returned home.
During their descent, a malfunction in the thrusters and venting systems caused toxic nitrogen tetroxide gas to accumulate inside the Apollo crew module. Unable to do anything about it until they splashed down, the astronauts pushed forward despite increasingly severe coughing. To make matters worse, they landed upside down, causing water to block the air intakes.
Struggling to stay conscious amid the toxic fumes, astronaut Tom Stafford managed to get oxygen masks for his crew, one of whom had already lost consciousness. The landing module was soon righted, and the deadly fumes cleared when the hatch was opened. However, the nearly suffocated crew was hospitalized for two weeks.
3. The Terrible Fate of Vladimir Komarov
Yuri Gagarin may be famous as the first human in space, but his fellow cosmonaut Vladimir Komarov is less well-known, despite having a far more harrowing and unforgettable mission.
The Soviet Union had planned a dramatic spacecraft rendezvous to mark the 50th anniversary of the Communist revolution. However, in their rush to meet the deadline, the spacecraft were hastily assembled and turned out to be little more than deadly traps. Komarov was selected to pilot the first craft. Knowing that if he refused, his friend Gagarin would be sent instead, Komarov accepted the mission, fully aware he wouldn’t survive the trip.
On April 23, 1967, Soyuz 1 launched with Komarov aboard, but the mission quickly fell apart. Almost everything malfunctioned as anticipated, and the flight was canceled. Upon reentry, the parachutes failed to deploy, and Komarov plummeted through the atmosphere, burning all the way down. US listening stations picked up his final moments, where he cursed the engineers who had condemned him to die. Komarov was nearly vaporized upon impact.
2. Space: Where You Can’t Hear Someone... Drown?
In July 2013, during a standard spacewalk on the International Space Station, astronaut Luca Parmitano from Italy experienced something unexpected while floating in the vacuum of space. He felt water collecting at the back of his head.
Confused but determined to finish the mission, Parmitano kept working until the water began spreading, eventually sticking to his face in the weightless environment. Alarmed, he reported the situation to Mission Control, who quickly called off the spacewalk. By then, the water had completely blinded Parmitano, filling his nose and most of his mouth.
Remarkably, he maintained his composure despite the threat of suffocation, navigating his way to the airlock purely by memory. His crew members were able to clear the water still clinging to his face. It was later discovered that a blockage had caused the suit's cooling system to malfunction, causing water to back up into Parmitano's helmet.
1. The X-15 Tragedy
Michael Adams was a highly skilled pilot, having earned multiple accolades for his extraordinary accomplishments. As a top candidate for the Air Force's Manned Orbiting Laboratory, Adams began astronaut training. However, sensing the program's likely cancellation, he opted instead to join the X-15 project. The X-15 was a hypersonic plane that flew so high that even its pilots, including Adams, earned the status of astronauts.
Adams's flight on November 15, 1967, began smoothly, but once he reached his cruising altitude of 80 kilometers (50 mi), electrical malfunctions started steering the plane off course. Within moments, he was caught in a rapid 5,500-kilometer-per-hour (3,400 mph) spin. His training helped him regain control of the supersonic aircraft, but he ultimately entered an inverted nosedive he could not recover from. The plane crashed into the California desert at a speed of 6,400 kilometers per hour (4,000 mph), and he was instantly killed.
