Minecraft wiki entry for Cauldron, associated text: Water in a cauldron does not absorb explosion damage; make sounds and particles; absorb fall damage; or damage endermen, striders, or blazes. Cauldrons do not deal drowning damage to mobs inside of them and fish act as if there is no water inside it. The player cannot float or swim in it, as the water is about level with the player's waist. Jumping in a cauldron does not produce any bubble or water particles.