The way that you drown when you're in the water on normal maps and on Frosty Jr.'s map is very annoying. Your oxygen bubbles do not replenish if you jump out of the water, and in most cases where you use a jetpack, you will still drown while in the air. two things that can stop this:
1. Just rework water physics and give players full oxygen when they jump out of water
2. Prevent drowning when you jump/fly out of water (as you will continue to drown until you touch land).