Which sentences in this excerpt from South show that Shackleton felt his men displayed determination in difficult situations?

In the excerpt from South, Shackleton illustrates his men's determination by highlighting their unwavering spirit and resilience in the face of adversity. He describes moments where they faced extreme challenges yet continued to push forward without surrendering to despair. Their ability to maintain morale and support one another during hardships showcases their collective resolve and tenacity. This determination is evident in Shackleton's admiration for their courage and commitment to the mission despite the dire circumstances.