Having been near death a couple times, I can say the human body seems to have mechanisms for physical trauma death more than advanced synthetic techniques.

Bleeding out really just gets you very cold pretty quickly, and then very, very sleepy. Also a warm, cozy feeling the closer you get to falling asleep. Drowning is similar, and so is asphyxiation but there’s a bit more panic and random colors first with asphyxiation before the void kicks in. You’d think it’d be the same as drowning but no - maybe with water there’s some primordial memory of the womb that activates?

If you do have a chance at surviving tho, make sure you stay awake.