system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5- Why is it dangerous for a scuba diver to ascend too quickly?
gpt
For the ELI5 answer, rising quickly does to your body what opening a can of soda does. Gas you breathe under pressure suddenly has much less pressure and comes out of your tissue like bubbles in a soda and causes damage. 

It's important to note that if you are snorkeling or free diving, you can rise as fast as you want because you weren't breathing air under pressure.