system
Given the following post, respond as if you're commenting on Reddit:
human
What would happen if you broke the sound barrier underwater?

Not only the phenomena, but what would happen to living organisms as well?
gpt
Cavitation becomes an issue at those speeds, so breaking the sound barrier underwater isn't something we've accomplished. In theory, you'd see a sonic boom, but more realistically, we'd see cavitation(like we do with certain species of mantis shrimp).