EXCELLENT! This will be mandatory reading on our boat. I nearly drowned in my aunt's pool as a child even though there were six other siblings/cousins in the pool with me. My aunt, dressed in her Sunday finest, dove in and grabbed me just as I slid down the ramp into the deep end. I had already begun the head back, gone quiet routine. SCARY STUFF!
Later in life, I became a search and rescue diver and unfortunately recovered numerous drowning victims from the waters of the Snake River. All but a couple victims had had friends or strangers nearby when they drowned and no one knew it or didn't realize it was happening until it was too late. Most, but sadly not all, were adults. Please pay attention and be safe.
