We moved deeper down the sandy slope, and then suddenly there was nothing beyond except bands of different colored water - blue, bluer, blue turning to darkness and mystery, the limitless blue of unfathomable nothingness. Below me a sheer wall plunged 7,000 feet. Looking down, I couldn't see anything turquoise, nothing that looked comforting. I was starting up when a long, silver shape suddenly caught my eye. It was George. But either he was well-fed or bored with divers for the moment, because he went his own way. And I went mine, content, slowly drifting up again through that magical turquoise water.