Before anyone had been to space, NASA simulated everything that could go possibly wrong – efforts that averted catastrophe as the Apollo 11 crew were about to land
Source:
https://www.newscientist.com/article/mg24332380-200-apollo-11-space-mission-diabolically-hard-practice-got-us-to-the-moon/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home