In Creative mode, when you are underwater for a long time, you will start to see bubbles as if you are drowning, but you can't drown or die in Creative mode.
What I expected to happen was...:
For no bubbles to appear at all.
What actually happened was...:
A couple of bubbles started appearing every second, as if you were being hurt.
Steps to Reproduce:
1. Go to a Creative world and go underwater
2. Stay there until you start seeing bubbles.