One of the best nonfiction books I've listened to (the audiobook is incredible, huge kudos to the narrator.)
It really sheds light on the sort of people who set out on these expeditions and what drives them to these feats, as well as how that drive can be their undoing. Frankly, it's the first nonfiction book that made me cry with empathy for their struggles, even knowing the explorers were deeply flawed men with colonist dreams - and being able to balance both of those realities, while also illustrating the progress in the expedition itself, is a feat. Note if you're sensitive to death, especially animal death, I'd avoid this.

I might even purchase a physical copy because it's a phenomenal reference and story.