system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is it that if you go in a 15 foot pool and reach the bottom the water pressure hurts your ears, yet scuba divers go hundreds of feet down and they don't feel a thing, shouldn't they be crushed under the weight/pressure ?
gpt
Every few feet you (ELI5) pinch your nose and blow through your nose which balances the pressure in your ears. You can try it right now, outside of water. Divers also have timers and depth readers to make sure they do not descend or ascend too fast without balancing their ear pressure.