While the player is unconscious, his HP is not visible.
This will make the game a little harder, since you don't know if he is alive or not.
This may be an unnecessary death, because in real life we do not know whether someone is alive, who suffocated or not.
The player is still alive, and he is already stuck in the fish, because we do not know that he is alive.
And to make sure that he is alive, you need to do everything possible, to pump and inject an injection into it, etc.
Conclusion one.
+ Complexity, + realism, - player)




Sorry, I translated on google translator

Basically already exists though: if someone is full health and unconscious their HP is not visible.

I say that when the player was unconscious and the HP was not completely, it was not visible

If that becomes a thing, it might be also good to become able to interact with the body and check player's breathing or pulse to see if they are alive or not.