Answer: The two themes that I have found are Man vs. Nature and heroism.
Explanation:After finishing the non-fictional story, The Man in the Water, by Roger Rosenblatt, I have come to the conclusion that there can be two underlying themes. The two themes that I have found are Man vs. Nature and heroism.According to Rosenblatt, the man in the water symbolizes the conflict between nature and human beings. He characterizes nature as impersonal- making no distinctions between good and evil, and having no principles, sympathy or animosity.