Thanks for link and it is good reminder for all.

I swim lengths at a local and very busy multi-purpose pool 2-3 times per week. I have seen a couple of close calls usually with younger children that their parents are not paying too much attention to. Although there are lifeguards on duty, they cannot always see everything at every second. As mentioned, drowning often doesn't look like drowning and it can happen so fast that most people will not realize what is happening until it is almost too late....or sadly when it is too late.