Of course, the specific background, the film did not explicitly say. The following are just my personal opinions:
1. Mickey doesn't want to be put into people. Look at what he said when he dreamed of his wife. Of course, it can have other meanings, such as how his wife and children died.
Second, the radio is not used for early help. If only Mickey is alone, it can be maintained for a few months, and then ask for help.
3. In that case, it is impossible for the "search and rescue team" to rescue all the people. If it is "doing research" outside, it is also a foreshadowing. The other two are foreshadowing: why the nuclear war broke out and Mickey's background.
4. In that case, death is more "releasing" than survival. The contrast at the end shows Eva who escaped and a skeleton on the side of the road.
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