I've spent a lot of time reading about mountaineering expeditions, including accounts of this specific, unfortunate climbing season—even Jon Krakauer’s popular book. I believe they managed to portray what happened fairly well in this film, which makes sense given that they consulted with Guy Cotter, who was both a climbing partner and business associate of Rob Hall, one of the leaders whose story is central to this tragedy. The movie does an acceptable job showing how impressive the mountain is while still concentrating on the characters' relationships and their personal struggles. The storyline sticks closely to what actually occurred, and the conversations feel natural. They did make alterations, naturally—like some details about the helicopter rescue—but they didn’t stray from the core elements. I think I share Guy Cotter’s view, who mentioned in an interview that he would have liked them to explore more thoroughly why climbers take such risks when ascending into the “Death Zone.” For a few people climbing Everest, the reasons are fairly ordinary: to earn respect by bragging about it, or to supposedly motivate others, or even to make money and become famous. However, serious mountaineers are driven by something deeper, tied to their sense of self. They feel compelled to climb; they can’t help themselves. There's a thrill in pushing their physical boundaries and appreciating the unique beauty at high elevations. If it were simple, they probably wouldn’t do it so much, almost as if they crave the discomfort, cold, and danger. When they are on the mountains they think about home; when they are home they dream of the mountains. It's similar to older boxing champions who continue fighting even when they should quit. Sure, they want the money, but even wealthy champions may keep fighting through pain and hardship for the applause and recognition it brings.

Source on TMDB