“Give the command,” Jinn said.
In a control room high above, someone pressed a button and sent out a coded command.
The murky water began to stir. The gray cloud coalesced into a tighter pattern and then moved toward the edge of the dam like a dark spirit drifting through the water.
“What’s happening?” Mustafa asked.
“The dam is made of aggregate,” Jinn said. “Easy to put together and held in place by its great weight, but not completely impervious.”
As he spoke, the silver sand adhered to the edge of the dam in two separate places: one spot near the top of the dam and a second about one-third the way down the sloping wall. After a minute or so, the progress of the tiny machines became noticeable in the cross section of the dam.
“Remarkable,” Alharma said, “the speed with which they penetrate.”
“The actual dam is much thicker of course,” Jinn pointed out. “But the effect will be the same, it will only take longer. A matter of hours, I should think.”
Within minutes the leading fingers of the horde had reached the central core of the dam. Progress slowed dramatically, but the etching continued until a pinprick had been bored through to the other side.
In another minute or two the sand had reached the right edge of the aggregate and broken through. A trickle of water began, quickly accelerating. Soon the weight of the water behind the dam was forcing out a jet of liquid through the tiny gap.
“This effect will be heightened in the real event,” Jinn said. “The weight of the water behind Aswan numbers in the trillions of tons.”
Even in the scale model, the breach was quickly being scoured and enlarged. Soon the gap was two inches in diameter and then four. Moments later a section of the top dropped in, taking the miniature road and cars along with it. The water from the high side of the tank flowed through the gap, pouring over the far side like a waterfall. But it was the lower tunnel through the dam that made things interesting.
As the water surged over the top, it reached a point of equilibrium, scouring downward far less rapidly where the waterproof clay core resisted the erosion.
“The dam is not falling,” Mustafa pointed out.
“Watch the lower tunnel,” Jinn insisted.
The lower tunnel finally made it through to the far side, and in minutes the higher-pressure water from the deeper part of the tank had widened the lower tunnel from a pinprick to a few inches in diameter.
Water blasted out the far side in a fine spray. After another minute, the core collapsed in the center, creating a deep V-shaped groove as the material above it caved in.
A huge wave surged through and crashed into the narrow channel that represented the Nile. It flooded the miniature embankments, sweeping away dirt, sand and small boxes that represented structures.
The test was successful, the dam was breached, the Nile was flooded. Mustafa and Alhrama stared in shock at the devastation.
Jinn smiled to himself and took a step back. It was the perfect moment. Sabah held the door behind him.
Mustafa turned and looked at them, grinning and expectant. He nodded to Sabah. The look on his face reminded Jinn of a thief with stolen treasures in hand. When Sabah took no action, the look changed, first to confusion, then to anger and fear. He must have now realized that Sabah would not kill his master.
The thief with the stolen goods had been caught and his face showed it. He reached for a w
eapon, but Sabah pulled Jinn aside and slammed the door.
In a blink, the hatch was locked tight. And the hammering of gunfire up against it did nothing but ring in their ears.
Mustafa began shouting from behind the door. “What are you doing? What is the meaning of this?”
From outside the room Jinn pressed an intercom switch. “The meaning is simple. You tried to turn my servant against me and he has passed the test. Now you will suffer the consequences.”
The sound of fists banging followed and then several more shots rang out, and Jinn was in wonder that the ricochets didn’t kill either Mustafa or Alhrama.
Alhrama began shouting. “Jinn, be reasonable! I have nothing to do with this.”
Jinn ignored them. He brought the radio up to his mouth once again. “Begin the frenzy.”
Up in the control room the operator punched another button, and the yellow drum was tilted farther, dumping more of the metallic sand into the pool. The murky gray color returned and deepened, and the water changed complexion once again. From outside the tank where Jinn and Sabah stood, it seemed as if the water had begun to boil.