“This is one of the transmitter ships as originally designed. Here are the power plants in the hold leading to the electromagnetic low-frequency antenna, which can be lowered into the sea.” He forwarded the picture. “This is the new ship that will do the work of our four experimental vessels.”

“A small ocean liner.Ingenious. How soon will it be on-site?”

“The old transmitter vessels have left the Mississippi shipyard and are on their way to the debarkation point in Rio. They can still be useful as decoys for insurance. The name of the liner is the Polar Adventure. She'll be in Rio as well, but no one will suspect she is carrying the payload.”

“You've made a final choice of a target site, then.”

Margrave pressed a key on the player. A map of the Southern Hemisphere appeared on the screen. The map showed a reddish patch shaped like a flattened sphere that covered a good portion of the ocean between the coast of Brazil and South Africa.

“The South Atlantic Anomaly.”

Margrave nodded. “As you know, the anomaly is a region where the earth's geomagnetic field flows the wrong way. Some scientists describe it as a 'pothole,' or a dip, in the field. There are sections where the field is completely reversed and weakened. Magsat discovered a North Polar region and a spot below South Africa where the magnetism has been growing extremely weak. Exploiting the weakness in the south ocean magnetic field will cause a similar reaction in the north pole region.”

Gant chuckled. “That's the beauty of this whole scheme. We're not precipitating the event as much as we're hastening its arrival.”

“True. The north and south magnetic poles have reversed themselves in the past without help, and the earth's electromagnetic field started collapsing on its own about a hundred and fifty years ago. Some experts say a shift is overdue. The earth's magnetism is already affected by the vortices in the molten layer under its crust. Stir up some additional turbulence and only a nudge will be needed to cause a shift. As you say, we're just helping the process along.”

“Fascinating,” Gant said. “I take it that there has been no change in our original expectations of the impact of this little flip.”

“The computer models still hold. The main magnetic fields will weaken, and then almost vanish. For three days or so, there will virtually be no magnetic poles. Then they will return with opposite polarity. Compass needles that normally point north will point south. The electromagnetic battering will knock out power grids and satellites, confuse birds and mammals, send polar auroras flashing around the equator and widen ozone holes. That will be the period of optimum danger. The collapse of the field will temporarily eliminate the earth's defense against solar storms. In the longer term, there will be an increase in the number of people who develop skin cancer.”