Inspiring (SPOILERS)

This is one powerful cine, and with no dialogue makes it even more hardcore.
Robert Redford's character is extremely inspiring, he never gave up until the very last minute when he literally could not go anywhere else.

All throughout the movie he tried his best physically and obviously mentally to stay alive and to try and get help. The very ending is up to us as the viewers to decide. As a Christian i'd like to think either Jesus supernaturally helped him or that it was rescue people.