So many problems
This is not a real movie / film.
This is a home video made among friends/family.
(1) Don't have a movie called 400 days when literally nothing happens --- not even subtle character conflicts) --- for the first 220 days then all *beep* breaks loose. So many movies provide examples of the "slow slip into madness" but this ignores all known examples of literature, film and science..... going into insta-cliche mode....
(2) Lack of any communication is not realistic for space travel - even long term, long distance travel
(3) NASA / space travel firms select high-functioning, mentally and emotionally stable people. None of these astronauts even alluded to being even somewhat convincing as a highly successful or intelligent person. Clearly bare-functioning actors dying for a paycheck.
(4) This experiment has already been conducted on small scale with NASA. In doing so, there's many aspects that they contradicted -- including lack of communication, supplies, etc.
http://legacy.wbir.com/story/news/local/2014/12/11/rscc-professors-break-world-record-for-living-underwater/20281155/
In sum, extraordinarily poor movie without the redeeming value of most low-budget films.