What are the motifs in Endurance: Shackleton's Incredible Voyage by Alfred Lansing?

Triumph amidst difficulty is a recurring idea in the book.Had the expedition vanished into the polar waste, as so many others did both before and after, there would likely have been no book. Instead, the fate of the men would be considered briefly in a footnote or a paragraph in a text devoted to the history of polar exploration and they would, today, be all but forgotten victims of the strange but unshakable human compulsion to explore. That they were marooned on floating ice, made a treacherous sea voyage in open boats through the most dangerous seas on the planet, and survived and indeed triumphed throughout disaster, is what is truly incredible about Shackleton's voyage.