"You taught us so many things," the gentle voice said. "You gave us so much."

"Help me!" The water was dark around her. The light was fading.

"Multiplicity. Motion. Lies. You showed us a universe infinitely larger than the one we had known."

"Look. Save my life and we'll call it even. Deal?"

"Gratitude. Such an essential concept."

"Thanks. I think."

And then she saw the turbot swimming toward her in a burst of silver bubbles. She held out her arms and the robot fish swam into them. Her fingers closed about the handles which Consuelo had used to wrestle the device into the sea. There was a jerk, so hard that she thought for an instant that her arms would be ripped out of their sockets. Then the robofish was surging forward and upward and it was all she could do to keep her grip.

"Oh, dear God!" Lizzie cried involuntarily.

"We think we can bring you to shore. It will not be easy."

Lizzie held on for dear life. At first she wasn't at all sure she could. But then she pulled herself forward, so that she was almost astride the speeding mechanical fish, and her confidence returned. She could do this. It wasn't any harder than the time she'd had the flu and aced her gymnastics final on parallel bars and horse anyway. It was just a matter of grit and determination. She just had to keep her wits about her. "Listen," she said. "If you're really grateful..."

"We are listening."

"We gave you all those new concepts. There must be things you know that we don't."

A brief silence, the equivalent of who knew how much thought. "Some of our concepts might cause you dislocation." A pause. "But in the long run, you will be much better off. The scars will heal. You will rebuild. The chances of your destroying yourselves are well within the limits of acceptability."

"Destroying ourselves?" For a second, Lizzie couldn't