Picture a perfect dive.
The diver's body plunges into the water, then arches smoothly back up to the surface. The underwater portion of the dive is U-shaped.
I have dived many times in my life. Yes, I know I haven't been swimming in ages, but I have dived at every given opportunity.
I don't think I've ever consciously come back up to the surface. It just happened automatically. In fact, I don't think I know how to get back up to the surface. So far in my life it has always happened, but I can't explain or visualize or imagine how it's done. That's rather scary.
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