The experience is one no words or pictures can convey fully, but I will try. Drifting over the tops of the coral structures, you get a sense of awe, of amazement that the natural world can produce such an astounding place. Each new area brings another thing of beauty into your view. As beautiful as our first and second sites were, the third one was exponentially better. All of your senses are alive, including the sounds of the water lapping in your ears and the crash of light surf on the edges of the reef. Physically you're being bounced around, trying carefully to avoid hitting of touching anything below. Your nose is clamped tight, but the light taste of salt water permeates your mouth. And visually you're on overload.
Just before climbing back onto the Calypso -- exhausted and yet energized -- it occurs to me that so rarely do you find things for which you have built up expectations over a lifetime, which then turn out to be everything you've dreamed. This was that sort of thing.