It can happen so quickly and without a sound.  Unfortunately, we know from our own experience. On June 10, 2006 our family attended a "Moving from the neighborhood" pool party being held in our honor.  We were looking forward to spending a nice summer evening with our kids and our friends.  Our 4 year old son, Brandon, and some other children decided to go into the hot tub portion of the pool.  So some other mothers and myself sat beside the hot tub to keep an eye on them.   Our youngest son “Birdie” came toddling into the pool area to sit with me while eating his hot dog and throwing pebbles into the pool.  I can still hear him laughing.  As I was watching "Birdie" some friends came up behind me and I turned my back to say hello.  They asked "where's Trevor?"  and  I looked beside me and said “He was just here; he must have gone to find Brad ”, but before I could finish the thought I panicked and began to look toward the pool. I looked into the shallow end and saw nothing, and then I looked toward the deep end and could not believe my eyes. There was our sweet “Birdie” in the deep end  next to a pair of sunglasses.  He must have seen the sunglasses and reached for them--not understanding the depth of the water--no splash, no sound.  How could this have happened?? He was just standing next to me!!!...It happens so fast.