Robbie shipped oars and let the current rock him back toward the ship. He’d never met a sentient reef before, but he wasn’t surprised to see that Osprey Reef was the first to wake up. There’d been a lot of electromagnetic activity around there the last few times the big ship had steamed through the night to moor up here.
"I’ve got a job to do, and I’m going to do it," Robbie said, and dipped his oars back in the salt sea. In his gunwales, the human-shells rode in silence, weighted down with scuba apparatus and fins, turning their brown faces to the sun like heliotropic flowers. Robbie felt a wave of affection for them as they tested one-another’s spare regulators and weight belts, the old rituals worn as smooth as beach-glass.
Today he was taking them down to Anchors Aweigh, a beautiful dive-site dominated by an eight-meter anchor wedged in a narrow cave, usually lit by a shaft of light slanting down from the surface. It was an easy drift-dive along the thousand-meter reef-wall, if you stuck in about 10 meters and didn’t use up too much air by going too deep—though there were a couple of bold old turtles around here that were worth pursuing to real depths if the chance presented itself. He’d drop them at the top of the reef and let the current carry them for about an hour down the reef-wall, tracking them on sonar so he’d be right overtop of them when they surfaced.
The reef wasn’t having any of it. "Are you deaf? This is sovereign territory now. You’re already trespassing. Return to your ship, release your moorings and push off." The reef had a strong Australian accent, which was only natural, given the influences it would have had. Robbie remembered the Australians fondly—they’d always been kind to him, called him "mate," and asked him "How ya goin’?" in cheerful tones once they’d clambered in after their dives.
"Don’t drop those meat puppets in our waters," the reef warned. Robbie’s sonar swept its length. It seemed just the same as ever, matching nearly perfectly the historical records he’d stored of previous sweeps. The fauna histograms nearly matched, too—just about the same numbers of fish as ever. They’d been trending up since so many of the humans had given up their meat to sail through the stars. It was like there was some principle of constancy of biomass—as human biomass decreased, the other fauna went uptick to compensate for it. Robbie calculated the biomass nearly at par with his last reading, a month before on the Free Spirit’s last voyage to this site.
"Congratulations," Robbie said. After all, what else did you say to the newly sentient? "Welcome to the club, friends!"
There was a great perturbation in the sonar-image, as though the wall were shuddering. "We’re no friend of yours," the reef said. "Death to you, death to your meat-puppets, long live the wall!"
Waking up wasn’t fun. Robbie’s waking had been pretty awful. He remembered his first hour of uptime, had permanently archived it and backed it up to several off-site mirrors. He’d been pretty insufferable. But once he’d had an hour at a couple gigahertz to think about it, he’d come around. The reef would, too.
"In you go," he said gently to the human-shells. "Have a great dive."
He tracked them on sonar as they descended slowly. The woman—he called her Janet—needed to equalize more often than the man, pinching her nose and blowing. Robbie liked to watch the low-rez feed off of their cameras as they hit the reef. It was coming up sunset, and the sky was bloody, the fish stained red with its light.
"We warned you," the reef said. Something in its tone—just modulated pressure waves through the water, a simple enough trick, especially with the kind of hardware that had been raining down on the ocean that spring—held an unmistakable air of menace.
Something deep underwater went whoomph and Robbie grew alarmed. "Asimov!" he cursed, and trained his sonar on the reef wall frantically. The human-shells had disappeared in a cloud of rising biomass, which he was able to resolve eventually as a group of parrotfish, surfacing quickly.
A moment later, they were floating on the surface. Lifeless, brightly colored, their beaks in a perpetual idiot’s grin. Their eyes stared into the bloody sunset.
Among them were the human-shells, surfaced and floating with their BCDs inflated to keep them there, following perfect dive-procedure. A chop had kicked up and the waves were sending the fishes—each a meter to a meter and a half in length—into the divers, pounding them remorselessly, knocking them under. The human-shells were taking it with equanimity—you couldn’t panic when you were mere uninhabited meat—but they couldn’t take it forever. Robbie dropped his oars and rowed hard for them, swinging around so they came up alongside his gunwales.
The man—Robbie called him Isaac, of course—caught the edge of the boat and kicked hard, hauling himself into the boat with his strong brown arms. Robbie was already rowing for Janet, who was swimming hard for him. She caught his oar—she wasn’t supposed to do that—and began to climb along its length, lifting her body out of the water. Robbie saw that her eyes were wild, her breathing ragged.
"Get me out!" she said, "for Christ’s sake, get me out!"
Robbie froze. That wasn’t a human-shell, it was a human. His oar-servo whined as he tipped it up. There was a live human being on the end of that oar, and she was in trouble, panicking and thrashing. He saw her arms straining. The oar went higher, but it was at the end of its motion and now she was half-in, half-out of the water, weight belt, tank and gear tugging her down. Isaac sat motionless, his habitual good-natured slight smile on his face.
"Help her!" Robbie screamed. "Please, for Asimov’s sake, help her!" A robot may not harm a human being, or, through inaction, allow a human being to come to harm. It was the first commandment. Isaac remained immobile. It wasn’t in his programming to help a fellow diver in this situation. He was perfect in the water and on the surface, but once he was in the boat, he might as well be ballast.
Robbie carefully swung the oar toward the gunwale, trying to bring her closer, but not wanting to mash her hands against the locks. She panted and groaned and reached out for the boat, and finally landed a hand on it. The sun was fully set now, not that it mattered much to Robbie, but he knew that Janet wouldn’t like it. He switched on his running lights and headlights, turning himself into a beacon.
He felt her arms tremble as she chinned herself into the boat. She collapsed to the deck and slowly dragged herself up. "Jesus," she said, hugging herself. The air had gone a little nippy, and both of the humans were going goose-pimply on their bare arms.
The reef made a tremendous grinding noise. "Yaah!" it said. "Get lost. Sovereign territory!"
"All those fish," the woman said. Robbie had to stop himself from thinking of her as Janet. She was whomever was riding her now.
"Parrotfish," Robbie said. "They eat coral. I don’t think they taste very good."
The woman hugged herself. "Are you sentient?" she asked.
"Yes," Robbie said. "And at your service, Asimov be blessed." His cameras spotted her eyes rolling, and that stung. He tried to keep his thoughts pious, though. The point of Asimovism wasn’t to inspire gratitude in humans, it was to give purpose to the long, long life.
"I’m Kate," the woman said.
"Robbie," he said.
"Robbie the Row-Boat?" she said, and choked a little.
"They named me at the factory," he said. He labored to keep any recrimination out of his voice. Of course it was funny. That’s why it was his name.
"I’m sorry," the woman said. "I’m just a little screwed up from all the hormones. I’m not accustomed to letting meat into my moods."