In 1991, 8 people shut themselves for 2 years inside an airtight Arizona dome, and the walls quietly swallowed their oxygen for 475 days before anyone figured out why

In 1991, eight people were sealed in a massive airtight dome in Arizona for almost two years, during which time the oxygen levels dropped dramatically due to unexpected biological processes, revealing critical lessons for future space missions.

Raccontata daeconomictimes.indiatimes.com