When I was about eight years old, I went to look for something I left near a motel swimming pool. I slipped into the deep end of the pool, I didn't know how to swim. At first I flailed as fast as I could, instinctively I suppose. This didn't help and I realized two things, I was still sinking and was getting tired. So I stopped and just stared ahead. I can't say I knew I was going to die, I just knew I was in trouble. Then my feet slowing hit the bottom of the pool, this startled me and it occurred to me I could jump and maybe catch the edge of the pool. For the first time I looked up and saw sky and leaped.
I was very lucky and made it the first time. When I got my head above the water, I was so exhausted I stayed there for a few minutes before climbing out of the water. Over the years, I've thought about this many times and, after a many years, came to the conclusion that calming myself after the initial terror probably saved my life. The calming came, I believe, because I was tired and stopped moving.