by decomposition. 23 A match of diatom shells to those found in the water may provide supporting evidence of the place of death. Artificial respiration is also much more effective without water in the lungs. Butler, Daniel Allen (1998). 61 People who drown are more likely to be male, young, or adolescent. Hyperventilation before any dive, deep or shallow, flushes out carbon dioxide in the blood resulting in a dive commencing with an abnormally low carbon dioxide level; a potentially dangerous condition known as hypocapnia. This prevents water from entering the lungs. Drownings in other fluids are rare, and often relate to industrial accidents. 4, significant amounts of water typically only enter the lungs later in the process. That includes mariners and even many (most) rescue professionals: It is impossible to die from hypothermia in cold water unless you are wearing flotation, because without flotation you wont live long enough to become hypothermic. For persons with seizure disorders, drowning is the most common cause of death by unintentional injury, largely in the bathtub. Free access to water: Effective barriers prevent young children from gaining access to the water Ineffective supervision: Drowning can occur anywhere there is water, and even in the presence of lifeguards. "Nonfatal and Fatal Drownings in Recreational Water Settings-United States ". Archived from the original on 12 December 2016. Retrieved 11 November 2009. "Drowning in fresh or salt water".