I hate to tell those that think this was a miracle but the situation is really not all that uncommon. And it's pretty established medical science.

The intense coldness of freezing water slows organ function and allows for prolonged survival without oxygen. The first documented case was in Switzerland with a young girl that fully recovered after being underwater for close to 45 minutes. In fact, hypothermia treatment is now commonly used to care for patients that have oxygen deprived brains but restored cardiac and pulmonary function. Dr. Atul Gwande outlines this in his book The Checklist Manifesto - which I highly recommend for this topic and the many others covered in the book. Dr. Gawande is a great writer and all of his books are well worth the time.

As for the movie, it was what pretty standard fair for this type of movie. Better production value and bigger name actors than most Christian movies but nothing overly noteworthy.