“No good.” The voice held an added urgency. “Still dropping, and we’re losing the pulse trace. We have to risk it. Give her a bigger jolt.”

The light pattern altered. There was a stab of magenta, a rapid twinkle of sapphire and cyan, then a scattershot of moving saffron and ruby dots on the icy wall. As the rainbow modulated, the bear responded to the signal. Slate-gray eyes flickered in the long, smooth head. The massive chest shuddered. “That’s as far as I dare take it.” The second voice was deeper. “We’re beginning to get more heart fibrillation.”

“Hold the level there. And keep an eye on that rectal temperature. Why is it happening now, of all times?”

The voice echoed anguished through the thick-walled cavern. The chamber where the bear lay was fifteen meters across, and through the outer wall ran a spidery filament of fiber optics. It passed beneath the ice to a squat box next to the beast’s body. Faint electronic signals came from needles implanted deep in the tough skin, where sensors monitored the ebbing currents of life in the great body. Skin conductivity, heartbeat, blood pressure, saliva, temperature, chemical balances, ion concentrations, eye movements and brain waves were continuously monitored. Coded and amplified in the square box, the signals passed as pulses of light along the optic bundle to a panel of equipment set outside the chamber’s wall.

The woman who leaned over the panel outside the chamber was about thirty years old. Her dark hair was cropped short over a high, smooth forehead that now creased with frown lines as she studied the monitors. She was watching one digital readout as it flickered rapidly through a repeated sequence of values. She was in her stockinged feet, and her toes and feet wriggled nervously as the digital readout values moved faster.