Cosmonaut candidate Anatoly Kartashov was badly injured during a centrifuge test in July 1960 and was subsequently suspended from the program without appeal.
Notes on verification
Confirmed by Smithsonian, NASA history site, Wikipedia (Vostok programme, Kartashov biography, list of training accidents), and Astronautix. Core facts—July 1960 centrifuge injury, hemorrhaging, permanent removal—are well corroborated; 'without appeal' is a characterization consistent with Gagarin's overridden advocacy for him.
Sources
- How Yuri Gagarin Was Picked to Be First in Space (smithsonianmag.com)
- https://www.nasa.gov/history/60-years-ago-soviets-select-their-first-cosmonauts/ (nasa.gov)
- http://www.astronautix.com/k/kartashov.html (astronautix.com)
- https://www.todayifoundout.com/index.php/2024/09/the-mysterious-death-of-yuri-gagarin/ (todayifoundout.com)