Komarov's was particularly sad. He knew he was going to die, and railed at the incompetence of the program engineers during the descent phase that he knew he wouldn't survive. The fact that the main problem was that the parachute straps had been hooked up wrongly was the final (preventable) insult to a brave man.
"Gagarin wrote a 10-page memo and gave it to his best friend in the KGB, Venyamin Russayev, but nobody dared send it up the chain of command. Everyone who saw that memo, including Russayev, was demoted, fired or sent to diplomatic Siberia. With less than a month to go before the launch, Komarov realized postponement was not an option. He met with Russayev, the now-demoted KGB agent, and said, "I'm not going to make it back from this flight."
Russayev asked, Why not refuse? According to the authors, Komarov answered: "If I don't make this flight, they'll send the backup pilot instead." That was Yuri Gagarin. Vladimir Komarov couldn't do that to his friend. "That's Yura," the book quotes him saying, "and he'll die instead of me. We've got to take care of him." Komarov then burst into tears.
On launch day, April 23, 1967, a Russian journalist, Yaroslav Golovanov, reported that Gagarin showed up at the launch site and demanded to be put into a spacesuit, though no one was expecting him to fly. Golovanov called this behavior "a sudden caprice," though afterward some observers thought Gagarin was trying to muscle onto the flight to save his friend. The Soyuz left Earth with Komarov on board.
Once the Soyuz began to orbit the Earth, the failures began. Antennas didn't open properly. Power was compromised. Navigation proved difficult. The next day's launch had to be canceled. And worse, Komarov's chances for a safe return to Earth were dwindling fast.
All the while, U.S. intelligence was listening in. The National Security Agency had a facility at an Air Force base near Istanbul. Previous reports said that U.S. listeners knew something was wrong but couldn't make out the words. In this account, an NSA analyst, identified in the book as Perry Fellwock, described overhearing Komarov tell ground control officials he knew he was about to die. Fellwock described how Soviet premier Alexei Kosygin called on a video phone to tell him he was a hero. Komarov's wife was also on the call to talk about what to say to their children. Kosygin was crying."
https://en.m.wikipedia.org/wiki/Vladimir_Komarov