Well is not a really old movie but all I can remember is a group that lands on mars, and then I think they are running out of oxygen, and then at the end they find this small place where there's water and oxygen, I remember there was a chick
Thanks

Is it Red Planet http://en.wikipedia.org/wiki/Red_Planet_%28film%29

Hope this will help:

http://www.youtube.com/watch?v=IjWs0AASVyA

http://www.imdb.com/title/tt0283015/