“Kasei and Dao didn’t find it that easy to remove.”

“No, but—” Sax did not want to say that their attempt had been botched, but he was afraid that she would read the comment out of his silence. “We in Da Vinci set up an X-ray laser complex in Arsia Mons caldera, buried behind a rock curtain in the north wall, and if we set it off the cable will be melted right at about the areosynchronous point. There isn’t a defensive system that could stop it.”

Ann stared at him; he shrugged. He wasn’t personally responsible for Da Vinci actions, no matter what people thought.

“But bringing down the cable,” she said, and shook her head. “It would kill a lot of people.”

Sax remembered how Peter had survived the fall of the first cable, by jumping out into space. Rescued by chance. Perhaps Ann was less likely to write off the lives that would inevitably be lost. “It’s true,” he said. “It isn’t a good solution. But it could be done, and I would think the Terrans know that.”

“So it may just be a threat.”

“Yes. Unless they’re prepared to go further.”

• • •

North of the Oxia archipelago they passed McLaughlin Bay, the eastern side of a drowned crater. North again was Mawrth Point, and behind it the inlet to Mawrth Fjord, one of the narrowest and longest fjords of all. It was a matter of constant tacking to sail up it, pushed this way and that by tricky winds, swirling between steep convolute walls; but Sax did it anyway, because it was a pretty fjord, at the bottom of a very deep and narrow outbreak channel, widening as one sailed farther into it; and beyond and above the end of the water, the rock-floored canyon continued inland for as far as one could see, and many kilometers beyond that. He hoped to show Ann that the existence of the fjords did not necessarily mean the drowning of all the outbreak channels; Ares and Kasei also retained very long canyons above sea level, and Al-Qahira and Ma’adim as well. But he said nothing of this, and Ann made no comment.

After the maneuvering in Mawrth, he sailed them almost directly west. To get out of the Chryse Gulf into the Acidalia region of the North Sea, it was necessary to work around a long arm of land called the Sinai Peninsula, sticking out into the ocean from the west side of Arabia Terra. The strait beyond it connecting Chryse Gulf with the North Sea was 500 kilometers wide; but it would have been 1,500 kilometers wide if it were not for the Sinai Peninsula.