There was nothing. Absolutely nothing! Not a atom, molecule; nothing. Bill scanned the entire pool again and saw nothing but the little molecules that made up the water.
The instructions told him to check the cameras so he did. After waiting for the super computer to check all the files for the last 4.5 billion years Bill shockingly looked at the results. Not a single picture had been taken before Bill had arrived and not a single second of the camera-snapshot-time had malfunctioned. If anything had moved in that water it would have had quadrillions of pictures taken of it.
And the cameras were also specialized for the chance of an animal having to move out of the encased pool. All precautions had been taken care of by Bob but not a single outcome came from his years of work.