Drowning is one of the many environmental hazards that affects entities
Drowning is triggered by sinking more than 10 real-life seconds into any liquid, except mineral water and lava, and it gives a damage of 100 points of health per second. This hazard can affect players and creatures as well.
For Players, the time until drown damage comences is represented with a "bubble" meter, and a bubble effect on the screen. To trigger the effect, the centered vertical axis of the upper block of the player must touch the block of liquid (does not matter if the liquid block is a source or not)