By the seventh week, the world had learned to live between pulses.
News channels no longer interrupted every programme when one occurred. Schools sent children home only if the lights failed for more than ten minutes. Offices added bottled water and torches to emergency cupboards, then returned to arguing about attendance. Videos of trembling windows competed online with recipes, election speeches and dancing dogs.
The extraordinary had not become ordinary.
It had merely acquired a schedule.
Kairavi no longer trusted that schedule.
At two thirty-seven on Thursday morning, she sat at her desk with four monitoring feeds open across two screens. A notebook lay beneath her left hand, its pages filled with intervals, corrections and questions she had stopped pretending she would organise later.
The pulses were arriving sooner.
That much had finally been acknowledged by every major research group studying them. The official models accounted for the change and continued to place the unknown critical threshold between three and four months after the first reading.
Kairavi’s model did not.
She checked the formula again.
The problem was not that the intervals were shrinking. The problem was that they were shrinking faster with every new cluster.
If a car gained the same amount of speed every minute, its acceleration remained stable. This was different. It was as if the car increased its acceleration every time the road shortened beneath it.
She deleted the comparison from the note she was preparing. A seismologist did not need an AI engineer explaining cars to her.
What a seismologist might need was the graph beneath the note.
Kairavi had built three versions. The first assumed that the changes between pulses were measurement noise. It produced the official three-to-four-month range. The second treated the acceleration as stable and reduced the estimate considerably. The third allowed the acceleration itself to increase.
That curve reached the threshold in less than three weeks.
Kairavi stared at it until the numbers lost meaning.
She was not a seismologist. The data was incomplete, several stations used incompatible sampling rates and the threshold itself was inferred from a change in waveform behaviour that nobody understood. A beautiful equation built on a wrong assumption remained wrong.
She wrote that sentence at the top of her email.
Then she attached the calculations and sent them to seven research institutions.
By morning, five had produced automated acknowledgements. One address rejected the attachment. The seventh sent nothing.
“You look terrible,” Mitali said when Kairavi reached the office.
“Good morning to you too.”
“Your hair is making independent decisions.”
Kairavi touched it and discovered that Mitali was correct.
They entered the lift with nine other employees. Someone had stuck a printed notice above the buttons:
IN CASE OF A SEISMIC PULSE, REMAIN CALM. THIS BUILDING IS EARTHQUAKE COMPLIANT.
Mitali read it twice. “Earthquake compliant?”
“It has signed the terms and conditions.”
“Excellent. I feel safe.”
The lift doors closed.
Kairavi had slept for ninety minutes. The pressure behind her eyes had become so familiar that she noticed it mainly when it disappeared. Her fever had fallen two days earlier, but a dull ache remained in her wrists and along her spine.
“You were working on the signal again,” Mitali said.
It was not a question.
“I sent the model to a few researchers.”
“At what time?”
“A professional time.”
“Kairavi.”
“Three twelve.”
Mitali waited until the other employees left the lift, then caught the doors before they closed.
“You found a pattern,” she said. “That does not make you responsible for the planet.”
“I know.”
“Do you?”
Kairavi stepped out. “No. But it makes me responsible for telling someone who might understand it.”
Mitali followed her onto the floor. “You have told them.”
“I sent seven emails.”
“Then tonight you sleep.”
“That sounded like an order.”
“It was polite but firm.”
Kairavi looked at her.
Mitali smiled. “I learn from the best.”
At eleven twenty, a reply arrived.
Dr Leela Menon introduced herself as a seismologist working with the international analysis group. Her message was brief and unsentimental.
Your normalisation choices are reasonable. Your projected threshold is not. You are treating observations from separate regions as comparable expressions of one process. Their amplitudes, local geology and instrument conditions differ. A shared interval does not prove a shared source.
Kairavi read it twice.
The criticism was valid.
She had aligned the timestamps because the pulses appeared together. She had then treated differences between stations as distortions around one underlying signal. That was an assumption, not a fact.
Below the criticism, Dr Menon had added another line.
However, your second-order acceleration is present in our internal data. If you are willing to join our emergency external-review group, use the secure link below. It includes a confidentiality agreement. Once access is approved, send the uncompressed model and your uncertainty calculations.
Kairavi forgot her headache.
The approval arrived twenty-three minutes after she signed. For the next two hours, she cleaned the files, documented every transformation and removed three lines of code that worked but would have embarrassed her if another person had seen them.
Mitali watched from the next desk.
“I thought tonight was for sleeping.”
“A scientist replied.”
“Scientists are the reason you need sleep.”
Kairavi sent the model at one forty-eight.
At one forty-nine, the lights dimmed.
Nobody reacted immediately. Power fluctuations had become common during the pulses, although no one had explained why a seismic event with no earthquake affected electrical systems.
The air-conditioning stopped.
The office fell quiet enough for Kairavi to hear the ventilation fans winding down.
Then the glass partitions began to hum.
The sound moved across the floor from east to west. One panel vibrated, fell silent and passed the note to the next. Coffee rippled inside mugs. Monitors flickered. Somewhere beyond the workstations, a woman cried out.
The pressure behind Kairavi’s eyes sharpened.
“Not the lifts,” she said.
Several people were already moving towards them.
“Use the stairs. The backup supply may not hold.”
Varun emerged from a meeting room with his phone raised. “Building management says remain at our desks.”
The easternmost glass panel bowed in its frame.
Kairavi saw the sequence again: vibration, silence, vibration. Each panel responded a fraction later than the one before it.
“They haven’t seen this floor,” she said. “Move away from the glass.”
The first panel cracked.
The sound ended the argument.
People moved at once. Chairs struck desks. Someone knocked over a monitor. The fire alarm began sounding even though there was no fire.
Mitali took charge of the employees near the conference rooms. Varun opened the emergency exit. Kairavi stood where she could see both corridors and directed people towards the eastern stairwell, behind the movement of the vibration rather than ahead of it.
For several seconds, the office changed before her eyes.
Faint lines seemed to appear along the glass frames, ceiling joints and electrical conduits. Some were bright and taut. Others broke into scattered fragments. The people suffering the worst dizziness carried the same faint distortion around their heads and chests.
Kairavi blinked.
The lines remained for another breath.
She understood none of them. Only one relationship appeared clear: the pressure had already passed through the eastern corridor, while the western side had not yet taken its full force.
“East stairs,” she repeated. “The west side hasn’t taken it yet. Keep moving.”
The first group reached the stairwell safely.
Another glass panel shattered behind them.
An employee named Dev had collapsed near the pantry. Mitali and two others lifted him under the arms. Kairavi counted the remaining people, checked the meeting rooms and directed a second group towards the same exit.
Then smoke appeared near the eastern door.
The backup-power cabinet had overheated. Dark smoke rolled along the ceiling outside the stairwell, and the emergency light above the door went out.
People stopped.
Kairavi looked west.
The bright lines there had faded. The partitions were no longer humming.
She made the decision.
“Use the western stairwell. Stay against the interior wall.”
Varun looked at the ceiling. “You said the pressure hadn’t reached that side.”
“It has passed now.”
That was what the pattern suggested.
Kairavi led them through the western corridor.
The first ceiling panel fell three steps ahead of her.
It struck the floor and burst into white fragments. Someone screamed. Kairavi stopped so quickly that Mitali collided with her shoulder.
For an instant, the lines seemed to return above them, brighter than before.
“Back!” Kairavi shouted.
The metal frame holding a suspended light tore loose.
Varun pushed the employee beside him away. The edge of the frame struck his shoulder and glanced across his forehead, knocking him to one knee.
Blood appeared immediately.
For a second, Kairavi could see nothing except the route she had chosen.
Then training, logic and guilt separated into different places.
“Mitali, take everyone back to the central meeting room. Interior walls, away from the ceiling fixtures.”
Mitali looked at Varun.
“I’m staying with him. Go.”
This time, nobody questioned her.
Kairavi crouched beside Varun. He was conscious, angry and trying to stand.
“Don’t,” she said.
“We need to move.”
“We will. Let me see your head first.”
The cut was narrow but bleeding heavily. He could still move the shoulder, although every attempt made him wince. Kairavi took a clean cloth from the emergency kit mounted on the wall and pressed it into his hand.
“Hold this here. Firmly.”
The vibration weakened.
Above them, the lines disappeared.
One moment they had filled the corridor. The next, Kairavi was staring at ordinary ceiling panels, metal brackets and cable trays.
She tried to call the lines back. Nothing returned. Whatever had happened was not a tool she could command; it had passed through her with the pressure and gone.
She had no explanation for what she had seen.
She did have an explanation for Varun’s blood.
“I was wrong about this corridor,” she said.
He looked up at her, one hand holding the cloth to his forehead. “You were right about the lifts.”
“Both are true.”
They waited until the safety team reached them. Two lifts had stopped between floors. No one inside was seriously injured, but the passengers remained trapped for nearly forty minutes. Across the building, eleven people were treated for cuts, falls or breathing difficulty. Dev’s fever reached 103°F.
Varun received four stitches and left with his arm in a sling.
By six, the office had closed for inspection.
Kairavi stood outside beneath a sky the colour of dirty glass. Employees gathered in small groups, replaying videos and improving their memories of what had happened. Some said the building had twisted. Others claimed the glass had moved like water.
Mitali handed Kairavi a bottle.
“Drink.”
Kairavi obeyed.
“You got most of us out,” Mitali said.
“I sent them into the western corridor.”
“After the other exit filled with smoke.”
“I thought the pressure had passed.”
“And you were wrong.”
Kairavi looked at her.
Mitali held her gaze. “You were wrong about one thing and right about several others. If you turn those into one judgement about yourself, you’re doing bad analysis.”
“Varun needed stitches.”
“Yes.”
Mitali did not soften the answer. Kairavi was grateful for that.
“I saw something,” Kairavi said.
“What?”
“Lines. Along the glass and the ceiling. Around some people.”
Mitali glanced at the building. “Like cracks?”
“No. Relationships.”
The word sounded inadequate the moment she used it.
“I don’t know,” Kairavi admitted. “It disappeared when the pulse ended.”
Mitali touched the back of Kairavi’s hand. “Then write down exactly what you remember. After you sleep.”
At home, Kairavi found three bags of rice beside the dining table and Rajeev arguing with a wholesaler on the phone.
“No, not tomorrow,” he said. “Tonight. Water, batteries and every first-aid kit you have. I’ll pay the difference.”
He ended the call and looked at the small bandage on Kairavi’s forearm. She had not noticed the cut until the safety team pointed it out.
“What happened?” he asked.
“A partition broke.”
Meera emerged from the kitchen. “You said you were fine.”
“I am fine.”
“You are bleeding.”
“Technically, I have finished bleeding.”
Meera took her wrist and inspected the bandage anyway.
Rajeev pointed towards the supplies. “You said to prepare.”
Kairavi looked at him. “You listened?”
“I listen.”
Meera made a sound from the back of her throat.
Rajeev ignored her. “The shop has bottled water, dry food, torches and basic medicines. I’ve ordered more. What else?”
For the first time she could remember, her father was not telling her what the family would do.
He was asking.
“Copies of everyone’s documents,” Kairavi said. “Cash in smaller notes. Power banks charged. Shoes and essential medicines together in one place. We decide where to meet if the phones fail.”
Rajeev nodded and began writing.
“This does not mean something terrible will happen,” she added. “It means we should be able to manage for a few days if services stop.”
“How long?” Aarohi asked.
She stood near the hallway with her laptop held against her chest.
Kairavi hesitated. “I don’t know.”
It was not reassuring. It was honest.
“I can help with the data,” Aarohi said. “I can collect reports from different cities and put them into one sheet.”
“No. You need to focus on college.”
“Didi—”
“You don’t know where those files come from. Some of these sites could—”
Kairavi stopped.
Rajeev’s pen was still against the paper.
She heard her own argument: danger first, permission never.
Aarohi waited.
Kairavi took a breath. “You can help. Use only the sources I send you, and do not download unknown attachments. If you develop a fever, dizziness or body pain, you stop and tell me. That part is not negotiable.”
Aarohi’s expression brightened. “Fine.”
“And you sleep by midnight.”
“That was not part of the deal.”
“It is now.”
Rajeev almost smiled.
Meera did not. She touched Kairavi’s forehead.
“You are warm again.”
“A little.”
“You will eat and sleep before opening that laptop.”
“I need to check whether Dr Menon replied.”
“The earth has survived this long without your email.”
Kairavi glanced at Rajeev. “Please explain to her that preparation matters.”
“Your mother is correct,” he said.
“Unbelievable.”
She ate. She did not sleep.
At eleven eighteen, after Kairavi’s temporary clearance appeared in the emergency group’s portal, Dr Menon called.
Her voice was lower than Kairavi had expected and carried the clipped exhaustion of someone speaking between emergencies.
“Are you somewhere private?” she asked.
Kairavi closed her bedroom door. Aarohi was working at the dining table outside.
“Yes.”
“Your model fails when we combine the amplitudes.”
Kairavi’s shoulders dropped.
“I expected it might.”
“It succeeds when we separate the regions.”
Kairavi sat down.
Dr Menon continued. “We kept trying to identify one origin point. There isn’t one. The timings correlate globally, but the pressure signatures are organising locally.”
“How many regions?”
There was a pause.
“Seven concentrations are appearing consistently enough to investigate. The boundaries are enormous. We cannot predict cities, and I will not pretend we can.”
“One per continent?”
“Approximately. Antarctica has the weakest coverage and the worst confidence. Do not turn that into a conclusion.”
Kairavi opened the encrypted image that had arrived from Dr Menon during the call.
A world map appeared. Seven translucent areas lay across it, each wide enough to cover countries. They were not circles. They bent around coastlines, mountain systems and features Kairavi could not identify.
The Asian region covered much of northern India and the surrounding territory.
At its centre, the newest signals pointed inward.
“What does the pressure represent?” Kairavi asked.
“We do not know.”
“What happens at the threshold?”
“We do not know.”
The honesty frightened her more than speculation would have.
“Will you publish this?”
“After independent verification. An emergency briefing has been called for tomorrow morning.”
Kairavi enlarged northern India. The map dissolved into overlapping uncertainty bands.
“My estimate was sixteen to twenty days.”
Dr Menon did not answer immediately.
Kairavi heard keyboards and distant voices at the other end of the call.
“Your timeline is wrong,” Dr Menon said.
Relief entered Kairavi so quickly that it almost became laughter.
“The latest pulse shifted even our most cautious range forward by six days.”
The relief vanished.
On Kairavi’s screen, the signals surrounding northern India leaned towards one another.
They were not passing beneath the region.
They were gathering there.