Bath time Curiousity?
Answers: I did that once, it resulted surrounded by a horrific ear infection as all the floating dirty soap rabble rushes into your ears.
You hear noise and jolting transferred through your common plumbing lines.
Vibrations (sound surge etc) travel faster in solid objects, as okay as probably being echo in the tub itself. So any little sound side would come up through the floor, into the bath and be magnified beneath the water =)
My guess anyway ... do you ever hear anything delicious?
Maybe the density of the water intensifies the the nouns vibrations and therefore enhance the sound from downstairs. Because you yourself are submerged contained by this medium, your audible range picks up on the sound more smoothly.
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