The very first man to go to space was a Soviet cosmonaut, Yuri Gagarin, who rose to the top of his class thanks to his stunning memory, quick reactions, and poise during emergencies. That poise would come in handy since his spacecraft couldn’t survive re-entry, used compromised design components, and ultimately took the astronaut through an 8g spin cycle on his way back to Earth.
The first manned space mission was launched with Vostok 1, and Yuri Gagarin at the helm. Gagarin had trained for years to be the first human to leave the atmosphere and had gotten the mission because his peers in cosmonaut training had voted that he was the best choice.
But it was a dangerous honor. After all, only animals had entered space before, and the U.S. and Soviet Union had less than stellar records of getting mammals back alive.
And the plan for getting Gagarin back wasn’t one to inspire confidence. First, while Gagarin had been selected partially based on his reflexes, he was locked out of the controls. And it wasn’t certain the spacecraft could slow itself down during re-entry. Instead, it relied on Gagarin ejecting at almost 4.5 miles above the Earth, right after he dealt with all the tumult of hitting the atmosphere.
As a bonus, there was a chance that the controls would simply fail in space, so Gagarin flew with 10 days worth of food in case he had to wait until his orbit decayed naturally.
The actual launch on April 12, 1961, went well. The rocket made it into space, the launch vehicle broke away, and Gagarin rode through one orbit of the Earth. So far, so good. But then, the service module failed to separate from the spacecraft.
When the two-module spacecraft hit the atmosphere, the modules tumbled around each other and began to burn up.
“I was in a cloud of fire rushing toward Earth,” he later said.
After about 10 minutes, the cable burned up and Gagarin’s spacecraft re-oriented itself slowly. Freshly drained from a trip around the Earth and an 8g flaming tumble through the atmosphere, Gagarin had to pull himself together and get to work quickly or else he could die on impact like some animals in prior tests.
Because, again, the capsule had little protection for the cosmonaut, and he couldn’t be certain he would survive the capsule’s impact with the Earth. So he had to activate his ejection seat almost 4.5 miles up. Gagarin and his capsule traveled separately from there. Gagarin landed near a farm and walked up, in full orange spacesuit and helmet, to the farmers for help.
He was quickly named a Hero of the Soviet Union and put on a high shelf where he couldn’t be broken. He was able to lobby for a potential return to space though, but a tragic training accident ended his life while he was still preparing for the mission.
On March 27, 1968, he was piloting a MiG-15, entered a steep dive, and crashed into a forest. An investigation in 2010 concluded that a vent was left partially open. This vent was supposed to be closed as the plane entered high-altitude flight so the pilots would have enough air in the cockpit. The investigator supposed that Gagarin and his co-pilot entered a steep dive to get back to a safe altitude to close the vent, but passed out and could never pull out of it.
(As a fun side note, Gagarin asked the bus to stop for him to piss while he was on the way to Vostok 1. Cosmonauts today remember him by taking a leak on their way to the launchpad.)