Drowning is an underused mechanic in tf2 by including it in your map you allow for a relatively unique gameplay experience to be formed simply by a players choice to remain underwater for an extended period of time, as such i think you should let players fill their lungs with water so they may better love the air.
If this is your first time logging in after the migration (Feb 8, 2022), you must reset your password to log in. Follow this guide if you're having trouble