Near Death Drowning

I went over the waterfall, head first, in a noodle, one of those long, spongy things that you can float with. The force of the water, pinned me to the bottom of the river, face down.  I noticed that I was not moving.  I was stuck in between two, stalagmite-like rock formations.  I was calm, oddly enough.  I never thrashed.  And I had no fear, although I knew that if I didn't get myself out of this situation, I would drown.