On 18 March 1965, a 30-year-old Soviet Air Force pilot named Alexei Leonov opened the hatch of an inflatable airlock on Voskhod 2 and became the first human being to float free in space. According to the Smithsonian National Air and Space Museum, he stayed outside for just over 12 minutes. Then the suit around him began to become the problem.
In vacuum, Leonov’s Berkut suit stiffened and ballooned. The Smithsonian says he had to vent air from the suit to fit back through the airlock, and that Soviet television and radio broadcasts ended once the trouble began.
Leonov later gave a more dramatic version of the emergency, saying his feet had pulled away from his boots and his fingers from his gloves, and that he had to force himself back in head-first. But a later Smithsonian Air & Space review by space historian Anatoly Zak cites contemporary documents and footage that complicate that version. In his immediate report, published decades afterward, Leonov said he had planned for the pressure drop in advance and re-entered feet-first.
That does not make the first spacewalk safe. It makes it stranger: a real emergency remembered through secrecy, propaganda, later memoir, and finally archival correction.
A spacecraft modified around one dangerous idea
Voskhod 2 was a Vostok-derived spacecraft with two seats and an inflatable external airlock called Volga. The airlock mattered because the capsule itself could not simply be depressurised for the spacewalk. Its systems needed an atmosphere inside the cabin.
The mission launched from Baikonur on 18 March 1965 with Pavel Belyayev as commander and Leonov as pilot. NASA’s Gemini IV mission page places Ed White’s first American spacewalk on 3 June 1965, which means Leonov beat the United States to EVA by less than three months.
The Soviet hardware had been built quickly. A Google Arts & Culture history of the first spacewalk notes that only nine months passed between the technical specification for the airlock and spacesuit and Leonov’s EVA.
Leonov’s task was simple in outline and brutal in practice: enter the Volga airlock, wait while Belyayev sealed him off from the cabin, open the outer hatch, move outside on a tether, then return before the spacecraft passed into darkness.
The first spacewalk lasted just over 12 minutes
The hatch opened above Earth. Leonov moved out on his tether while the Soviet Union broadcast images of the achievement to the public.
The National Air and Space Museum says Leonov remained outside for just over 12 minutes, the world’s first walk in space. NASA-hosted Smithsonian video material gives the same date and says he remained outside Voskhod 2 for just over 12 minutes.
Outside the spacecraft, the physics was unforgiving. A pressure suit is a small human-shaped spacecraft. It has to hold gas in when the outside pressure falls almost to zero.
The result was not a soft garment but an inflated pressure vessel. The suit swelled, the joints resisted movement, and Leonov had to work against the thing keeping him alive.
That is the core fact that survives every version of the story. The first human spacewalk was not only a triumph of courage and engineering. It was also an immediate lesson in how badly a suit can fight the body inside it.
The valve became the difference between outside and inside
Leonov reduced the pressure in his suit so it would become flexible enough to get him back through the airlock. The National Air and Space Museum describes the venting as risky, and later accounts identify the danger as the loss of pressure margin and the possibility of decompression sickness.
In his 2005 Smithsonian account, Leonov wrote that he decided not to tell mission control before opening the pressure valve because he believed he was the only person who could bring the situation under control. That version also says he pulled himself in head-first and then had to turn around inside the airlock.
But the later Smithsonian review by Zak says the contemporary record points to a less cinematic sequence. Leonov’s immediate post-flight report said he had planned to switch suit pressure from 0.4 atmospheres to 0.27 atmospheres if the first re-entry attempt failed, and that he inserted both legs into the airlock first.
For publication, the article should not state the head-first entry, the flip inside the airlock, or the “ears nearly burst” detail as settled fact. The safer version is that the suit ballooned, Leonov lowered its pressure through a valve, and the later memoir version was more dramatic than the contemporary record supports.
The danger did not end when the hatch closed
Once Leonov was back inside, Voskhod 2 still had to survive the rest of the flight. Encyclopedia Astronautica summarises the mission as a first spacewalk followed by cascading trouble: an oxygen-flooded cabin, manual re-entry, and an off-target landing.
The cabin oxygen problem mattered because oxygen-rich environments turn small ignition risks into catastrophic ones. Less than two years later, Ed White would die with Gus Grissom and Roger Chaffee in the Apollo 1 fire during a ground test on 27 January 1967.
Then the automatic re-entry system failed. Belyayev and Leonov had to orient the spacecraft manually and choose the re-entry timing themselves, a demanding procedure inside a cramped capsule after a mission that had already nearly gone wrong.
The descent put them far from the planned recovery zone. Leonov’s Smithsonian account says they came down in deep snow in a taiga of fir and birch, with the hatch jammed against a tree and the cold becoming the real immediate enemy.
The forest became the second survival problem
The common retelling says wolves were nearby. Leonov’s own account is more careful: he wrote that the taiga was habitat for bears and wolves, and that spring was a dangerous season for both, but the immediate hardship he describes is cold, snow, wet clothing, and the difficulty of rescue.
Aircraft found them, but could not lift them out that first night. Supplies were dropped. Some were useful. Some were not. Leonov wrote that an axe was thrown from one aircraft, and that warm clothing was dropped from another.
The first night was spent in and around the capsule in severe cold. The next day, an advance rescue party reached them on skis, but a helicopter still needed a clearing. Leonov and Belyayev spent another night in the forest before skiing out to a helicopter pickup.
The public version in 1965 did not carry that texture. It carried the achievement. The Soviet Union had put a man outside a spacecraft and brought him home.
Every later EVA began after Leonov’s valve
NASA’s Gemini IV mission showed how quickly the United States followed. Ed White stepped outside on 3 June 1965, used a hand-held maneuvering unit until its gas ran out, and spent 23 minutes outside before returning to the spacecraft.
Later EVAs made the lesson clearer. Astronauts needed handholds, footholds, cooling, restraint layers, choreography, and long preparation. A human being outside a spacecraft was not simply floating. He was working inside a machine that had to bend, breathe, cool, seal, and survive.
That is why Leonov’s first spacewalk still feels modern. The image is simple: a man outside a capsule, Earth below him, a tether between him and the only pressurised cabin in reach. The engineering lesson is harsher. In space, even the suit can become terrain.
Sixty-one years later, every astronaut who has stepped outside a spacecraft has done so on the far side of that first valve, after the moment when Leonov learned that the difference between returning and remaining outside could be measured in the pressure inside a suit.
