system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - Why does everything sound muffled underwater if sound travels 4x faster in water?
gpt
It’s a lot to do with how fast your diaphragm in your ear can vibrate which increases clarity.   The faster the eardrum can move the more information it can resolve.  The increased viscosity of the water compared to the air reduces the sensitivity of the ear.