Timothy Cade stood on the ocean floor, rocked by the rhythm of the water, and he gazed around at the wondrous undersea landscape. It was so peaceful beneath the waves. He had always found a cool serenity there, as though it were a dream. Reeds flapped like banners, pushed and pulled by the deep tide. Dozens of breeds of fish swam in these waters, a kaleidoscope of colors in motion. Burrow crabs skittered from beneath clumps of...