...to appreciate this film, and even then it could be better.
Mars does have water, btw, and a breathable atmosphere could be produced through various processes. The huge dome for just one farm is a bit of a stretch.
But this isn't really about Mars, and the sci-fi elements are mainly window dressing.
Many questions are raised, but answers are scant and no more than hints. If you can be patient with that, it tells an interesting story about human nature and desperation, but it is a rather grey and grim story with nothing uplifting.
That, in the end, is why I don't give it more than 5 stars, despite good performances and accomplishing a lot on a limited budget. It's very dystopian, in the most depressing sense.