Russia's long-duration space journey on Earth put 6 people in isolation for a year 

 Russia kicked off another one of its simulated missions this week, this time a 360-day isolation of individuals to imitate flight conditions of a deep space journey. 

https://cdn.mos.cms.futurecdn.net/fhm2tWYVSXvPrCorfU8kwP.jpg

https://www.space.com/russia-sirius-23-astronaut-isolation-study