OT NASA CHAPEA Mars Simulation.

Four volunteers have spent 378 days living in a 1,700-square-foot space
3D-printed by NASA to simulate conditions on Mars. Fascinating.
"The volunteers grew their own vegetables, maintained equipment,
participated in so-called Marswalks and faced stressors that actual
space travelers to Mars could experience, including 22-minute
communication delays with Earth."
https://www.npr.org/2024/07/07/nx-s1-5032120/nasa-mars-simulation-volunteers-year

Four people in 1700 square feet for over a year? (If it was a SF story,
at least two of them would have gone mad or been killed.)
What about water? Gravity?