Artificial creatures react to their world according to programmed rules of behavior.
The process becomes more like the making of an actual documentary, wherein interesting occurences must be sought out, not produced. Basically, as they approach the surface, the chance that they will shoot themselves upward increases. When fatigue rises, they go to sleep. Lower level functions, like walking and running, are controlled mainly by sine waves. They run when far from their destination, walk when close, and assume the appropraiate action when adjacent.