End of paragraph 3
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I think Marlow is apprehensive about this trip. It is unlike any other he had ever taken,
The best way I can explain it to you is by saying that, for a second or two, I felt as though, instead of going to the centre of a continent, I were about to set off for the centre of the earth."
The centre of the earth brings to mind a heat oppressed sort of Hell, a Dante-like vision of devils torturing the meek and sick. This isn't unlike the heat and white devil's he will encounter in the Congo.