Dream interpretations of people living in sewers:
2. You might have seen maintenance or construction workers entering sewers and emerging out of them. This memory was stored and sometimes retrieved to be replayed in dreams. If so, this would be a dream triggered by nostalgia.
3. Your brain invented this dream as a mash up of the movie on ninja turtles who lived in sewers and homeless people. This is an imaginative dream.
After reflection, especially on your circumstances in the daytime preceding this dream, you will get clues on what triggered this dream.
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