https://en.wikipedia.org/wiki/World_Without_Sun https://en.wikipedia.org/wiki/World_Without_Sun ? Available at https://www.youtube.com/watch?v=6cIjgL2lkwA https

https://en.wikipedia.org/wiki/World_Without_Sun https://en.wikipedia.org/wiki/World_Without_Sun ? Available at https://www.youtube.com/watch?v=6cIjgL2lkwA https://www.youtube.com/watch?v=6cIjgL2lkwA . Don't know what details it covers - just found out about it now when researching your question. Edit: https://youtu.be/6cIjgL2lkwA?t=1138 https://youtu.be/6cIjgL2lkwA?t=1138 says that the aquanauts take turns 'sunbathing' in UV rays for 10 minutes each day, for health and morale. At around 18:00 "Their sense of time has become hazy. They neglect the clock and the calendar."