Late to the party, as usual ...
Everest
As others have said, not an easy or enjoyable watch. It was a bit like Casualty. You try and work out at the start who's going to die, and how, adjusting en route for bad decisions, then see how many you can tick off at the end.
Ye gods. I think I value my life too much to go doing that sort of thing, and I'm fine with that. Way above the acceptable risk level. The saddest one was the little Japanese woman topping her seventh summit. She was the most sympathetic character IMO, and she died a horrible lonely death, and she's still up on that mountain, freeze-dried. Sheesh.