You'll never know. The lower the frequency, the further away the source is likely to be; often these vibrations run along sewer pipes. Perhaps you could google up "ways to survive Chinese water torture". Use the situation as an opportunity to strengthen your mind.
The humming sound
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You'll never know. The lower the frequency, the further away the source is likely to be; often these vibrations run along sewer pipes. Perhaps you could google up "ways to survive Chinese water torture". Use the situation as an opportunity to strengthen your mind.