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Anomaly flashed in one corner of the screen.

"What? What is it?"

"Processing. Please be patient."

The booth etched a line along the bottom of the display: VAC Area 19, it said.

Another beep. Another flashing red pinpoint, farther forward.

Another line: Brodman Area 37.

"What are those red spots?" Clarke said.

"Those parts of the brain are involved in vision," the booth told her. "May I lower the helmet visor to examine your eyes?"

"I'm wearing eyecaps."

"Corneal overlays will not interfere with the scan. May I proceed?"

"Okay."

The visor slid down. A grid of tiny bumps stippled its inner surface. The humming of the machine resonated deep in her skull. Clarke began counting to herself. She'd endured twenty-two seconds when the visor withdrew into its sheath.

Just under Brodman Area 37: Ret/Mac OK.

The humming stopped.

"You may remove the helmet," the booth advised. "What is your chronological age?"

"Thirty-two." She hung the helmet on its peg.

"Did your visual environment change substantially between eight and sixteen weeks ago?"

A year spent in the photoenhanced twilight of Channer Vent. A blind crawl along the floor of the Pacific. And then, suddenly, bright sky…

"Yes. Maybe."

"Does your family have a history of strokes or embolisms?"

"I–I don't know."

"Has anyone close to you died recently?"

"What?"

"Has anyone close to you died recently?"

Her jaw clenched. "Everyone close to me has died recently."

"Have you been exposed to changes in ambient pressure within the past two months? For example, have you spent time in an orbital facility, an unpressurized aircraft, or been free-diving below a depth of twenty meters?"

"Yes. Diving."

"While diving, did you undergo decompression protocols?"

"No."

"What was your maximum dive depth, and how long did you spend there?"

Clarke smiled. "Three thousand four hundred meters. One year."

The booth fell silent for a moment. Then: "People can not survive direct ascent from such depths without undergoing decompression. What was your maximum dive depth, and how long did you spend there?"

"I didn't have to decompress," Clarke explained. "I didn't breathe during the dive, everything was elect—"

Wait a minute…

No decompression, she'd said.

Of course not. Let the surface-skimming tourists breathe from their clunky tanks, risking narcosis or the bends whenever they ventured too far from the surface. Let them suffer nightmares of exploding lungs and eyes marbling into clusters of fleshy bubbles. Rifters were immune to such worries. Inside Beebe Station, Lenie Clarke had breathed at sea-level; outside, she hadn't breathed at all.

Except once, when she'd been shot out of the sky.

On that day Forcipiger had fallen slowly through a dark spectrum, green to blue to final lightless black, bleeding atmosphere from a thousand cuts. With each meter a little more of the ocean had forced its way in, squeezed the atmosphere into a single high-pressure pocket.

Joel hadn't liked the sound of her vocoder. I don't want to spend my last few minutes listening to a machine voice, he'd said. So she'd stayed with him, breathing. They must have been at thirty atmospheres by the time he'd popped the hatch, cold and scared and sick of waiting to die.

And she had come ashore, raging.

It had taken days. Her ascent along the seabed would have been gradual enough to decompress naturally, the gas in her blood easing gently across the alveolar membranes—if her remaining lung had been in use at the time. It hadn't been: so what had happened to those last high-pressure remnants of Forcipiger's atmosphere in her bloodstream? The fact that she was still alive proved that they weren't still within her.

Gas exchange isn't limited to the lungs, she remembered. The skin breathes. The GI tract breathes. Not as fast as a set of lungs would, of course. Not as efficiently.

Maybe not quite efficiently enough

"What's wrong with me?" she asked quietly.

"You have recently suffered two small embolisms in your brain which intermittently impair your vision," the medbooth said. "Your brain likely compensates for these gaps with stored images, although I would have to observe an episode in progress to be certain. You have also recently lost someone close to you; bereavement can be a factor in triggering visual-release hall—"

"What do you mean, stored images? Are you saying these are memories?"

"Yes," the machine replied.

"That's bullshit."

"We're sorry you feel that way."

"But they neverhappened, okay?" Shit-for-brains machine, why am I even arguing with it? "I remember my own childhood, for fuck's sake. I couldn't forget it if I tried. And these visions, they were someone else's, they were—"

— happy

"— they were different. Completely different."

"Long-term memories are frequently unreliable. They—"

"Shut up," she snapped. "Just fix it."

"This booth is not equipped for microsurgery. I can give you Ondansetron to suppress the symptoms. You should be aware, though, that patients with extensive synaptic rewiring may experience side effects such as mild dizziness —"

She froze. Rewiring?

"— double vision, halo effects—"

"Stop," she said. The booth fell silent.

On the display, that cloud of violet stars sparkled enigmatically along the floor of her brain.

She touched it. "What are these?"

"A series of surgical lesions and associated infarctions," the booth replied.

"How many?"

"Seven thousand four hundred eighty three."

She took a breath, felt distant amazement at how steady it felt. "You're saying someone cut into my brain seven thousand four hundred and eighty-three times?"

"There's no evidence of physical penetration. The lesions are consistent with deep-focus microwave bursts."

"Why didn't you tell me before?"

"You asked me to ignore subjects irrelevant to your hallucinations."

"And these—these lesions don't have anything to do with that?"

"They do not."

"How do you know?"

"Most of the lesions are not located within the visual pathways. The others act to block the transmission of images, not generate them."

"Where are the lesions located?"

"The lesions lie along pathways connecting the limbic system and the neocortex."

"What are those pathways used for?"

"Those pathways are inactive. They have been interrupted by the surgical—"

"What would they be used for if they were active?"

"The activation of long-term memories," said the booth.

Oh God. Oh God.

"Is there any other way we can be of service?" the booth asked after a while.

Clarke swallowed. "How—how long ago were the lesions induced?"

"Between ten and thirty-six months, depending on your mean metabolic rate since the procedure. This is an approximation based upon subsequent scarring and capillary growth."

"Could such an operation take place without the patient's knowledge?"

A pause. "I don't know how to answer that question."