In 1972, NASA sealed 3 astronauts inside a 20-foot chamber for 56 days to rehearse Skylab; the ground experiment exposed hardware and medical problems before launch

In 1972, three astronauts conducted a remarkable ground simulation, residing in a sealed chamber for a staggering 56 days. This experiment was pivotal in preparing for the upcoming Skylab space station mission. Unexpectedly, engineers uncovered hardware failures and health challenges, as astronauts unexpectedly lost weight due to erroneous dietary calculations.