“You didn’t recruit a deep-sea submersible pilot to operate a drone.” I glanced at the shaggy-haired American, who looked more like a graduate student than an engineer. “Mr. McFarland, why don’t you cut through Dr. Ahmed’s politics and tell us how Bill Stone and his team at Stone Aerospace intend on delivering a manned vessel into a lake buried under two-and-a-half miles of ice.”

George McFarland grinned. “As I’m sure you know, Dr. Stone has been developing robotic explorers to access hard-to-reach exotic environments for years. Our focus of late has been the frozen ocean on Jupiter’s moon, Europa, which has an ice sheet twenty times as thick as Antarctica’s. Europa and Vostok present similar technical challenges. First and foremost, we need a far more efficient way to descend through miles of ice while maintaining the integrity of the borehole. The Russians have been pouring kerosene and Freon down their ice shaft, a move that has pissed off the entire international community. Vostok has remained preserved for fifteen million years; the last thing we want to do is introduce toxic chemicals into the habitat.

“Then there’s the issue of hydrostatic pressure created by the sheer weight of the ice sheet sitting on top of these subglacial bodies of water. Vostok is essentially a massive topographic hollow filled with water that is being squeezed beneath trillions of tons of ice. Think of it as a giant water-filled balloon. Puncture Vostok and water explodes out the exit at five thousand pounds per square inch of pressure. The Russians learned this the hard way when they retracted their last ice core and water blasted up through the borehole, flooding their drill cab with a hundred cubic meters of kerosene.”

McFarland powered on his laptop and turned the monitor to face Brandy and me. On screen was a six-foot-long cylindrical device. “This is Valkyrie, the cryobot we designed for Europa. The vehicle is an autonomous ice-penetrating machine. It is linked by fiber-optic cable to a power source that remains on the surface and is equipped with a high-powered laser that quickly melts the ice ahead of it. The hole then re-freezes behind the cryobot, preventing the pressure from forcing water out of the shaft. To return topside you simply invert the unit and blow ballast, and the capsule melts its way back to the surface, rising up on its own bubble with the hole re-freezing behind it.

“The three-man submersible we’ve designed will be flanked by two Valkyrie lasers. Once the lake is reached, the sub will run autonomously. When it’s time to ascend, the Valkyries will burn a borehole through the ice, raising the sub on a geyser of water created by Lake Vostok’s own internal pressure. Cool, huh?”

I shook my head in amazement. “It’s an incredible feat of engineering, but why a submersible? Why not simply let the Valkyrie unit do its job?”