"Now," she said, "it is time. The most important moment of your lives. And you must swim! Swim as hard as you can; swim for your lives!"

And the people responded.

There was a surge of movement, of almost exhilarating intent. The people beat their flukes as one, and a jostling mass of flesh and carapaces scrapped down the tunnel.

Cilia-of-Gold hurried ahead of them, leading the way towards the tunnel mouth. As she swam she could feel the current the people were creating, the plug of cold tunnel water they pushed ahead of themselves.

Within moments the tunnel mouth was upon her.

She burst from the tunnel, shooting out into the open water of the cavern, her carapace clenched firm around her. She was plunged immediately into a clammy heat, so great was the temperature difference between tunnel and cavern.

Above her the Ice of the cavern roof arched over the warm chimney mouth. And from all around the cavern, the helmet skulls of Heads snapped around towards her.

Now the people erupted out of the tunnel, a shield of flesh and chitin behind her. The rush of tunnel water they pushed ahead of themselves washed over Cilia-of-Gold, chilling her new.

She tried to imagine this from the Heads' point of view. This explosion of cold water into the cavern would bring about a much greater temperature difference than the Heads' heat-sensor skulls were accustomed to; the Heads would be dazzled, at least for a time: long enough -- she hoped -- to give her people a fighting chance against the more powerful Heads.

She swiveled in the water. She screamed at her people, so loud she could feel her cilia strain at the turbulent water. "Now! Hit them now!"

The people, with a roar, descended towards the Heads.

Kevan Scholes led Larionova down the wall-mountain slope into Chao Meng-Fu Crater.

After a hundred yards they came to another rover. This car was similar to the one they'd abandoned on the other side of the summit, but it had an additional fitting, obviously improvised: two wide, flat rails of metal, suspended between the wheels on hydraulic legs.

Scholes helped Larionova into the rover and pressurized it. Larionova removed her helmet with relief. The rover smelled, oppressively, of metal and plastic.

While Scholes settled behind his controls, Larionova checked the rover's data desk. An update from Dolores Wu was waiting for her. Wu wanted Larionova to come to Caloris, to see for herself what had been found there. Larionova sent a sharp message back, ordering Wu to summarize her findings and transmit them to the data desks at the Chao site.

Wu acknowledged immediately, but replied: I'm going to find this hard to summarize, Irina.

Larionova tapped out: Why?

We think we've found an artifact.

Larionova stared at the blunt words on the screen.

She massaged the bridge of her nose; she felt an ache spreading out from her temples and around her eye sockets. She wished she had time to sleep.