"Drowning: The process of experiencing respiratory impairment from submersion or immersion in water." CDC definition.
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Congrats on the Rescue Diver accomplishment...might I also suggest taking a lifeguard training course to further your knowledge and skill level in the area of water safety/rescue. You will also learn the differences between active and passive drownings. Secondary drownings are a real concern for those who have had an active or passive drowning event as well as in-water seizures and ascent blackouts from freediving. If you're looking for some great reading material on drownings and especially the physiology of drowning, the best and most straightforward info I know of can be found in the YMCA "On the Guard" lifeguard training manual. Your local library should have a copy of the latest edition.