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The mayor is away working on an undisclosed project.

Juliette worries about Solo remaining isolated with the children.

Lukas reports that numerous reassignments have left his workplace short-staffed.

The voice speaking with Lukas urges him to continue investigating the data.

Charlotte exercises by carrying two drone batteries through a circuit of lunging squats around the warehouse.

Elise finds Jimmy in the grow pits and insists it is time to leave.

Neighboring Silo

Juliette regards the empty silo holding her friends as a tomb she cannot reach.

Juliette requests that Courtnee have the backup generator fully serviced before installation.

Elise reports that Hannah expects dozens of people to arrive after Jewel comes.

Raph has pale arms strengthened by years of mining.

Rickson heads down the staircase with the others ahead of Jimmy and Elise.

Juliette remembers reconnecting with her father after almost twenty years of avoidance.

The outer wall of Silo 18 has two rows of reinforcing bars separated by two feet of concrete.

The machine beyond the wall has struts, bolts, hose, and plate steel marked by chipped paint and rust.

Lukas suggests people might as readily believe Walker came from another silo as believe Juliette’s actual rescued friends did.

The wounded cryopod occupant identifies himself as Paul Thurman, formerly addressed as Senator.

Bobby operates the excavator as work resumes on widening the opening.

Shirly is the new head of Mechanical.

Charlotte's Radio

Charlotte’s partly assembled radio can receive several stations.

Lukas reports that Billings has received a dozen complaints about the possible consequences of digging.

Connecting Tunnel

Juliette’s proposed tunnel follows an arc between the generator rooms of Silos 18 and 17.

Nelson is the young IT technician in charge of the cleaning lab.

Elise's Memory Book

Elise takes her memory book with her in a shoulder satchel as the group moves downstairs.

A brown puppy frightens Jimmy before licking Courtnee’s chin.

Jimmy thinks Miles is the twin pressing his ear against the concrete to listen to the digging.

Darcy is the night guard who was first on the scene and alerted Deputy Stevens.

Father Wendel is bald and wears white robes.

Lukas reports that the supplied passcodes work for his investigation of server six.

The drones use silicon-carbon batteries about the size of toaster ovens.

Fitz is an oilman with missing teeth.

Marcus pulls his twin brother back from the wall with visible excitement.

Shaw is a green-eyed boy with short-cropped hair who is slightly older than Elise.

A medical assistant confirms that the woman in the cryopod labeled Anna is dead.

Bobby reports that Erik can spare girders for only a thousand yards of tunnel.

Dawson is the new third-shift foreman.

Juliette’s project requires a further suit for an additional person in the second airlock.

Young Mother's Baby

Hannah’s baby sleeps peacefully during the initial wait for the digger.

Mechanical’s workforce was already depleted by violence when workers were called away for the excavation.

Backup Generator

Measurements indicate that the backup generator fits the digger’s mounts.

Drone Control Room

The room of pilot stations contains a desk under a bank of large monitors where Charlotte assembles the radio.

Supply sided with Mechanical during fighting that badly damaged its entrance.

Captain Brevard

Captain Brevard is Silo 1’s Security chief.

Charlotte believes the map’s lines lead to a better place marked S-E-E-D.

Drone Launch Lift

The drone lift has a nearly invisible, knee-high door painted the same color as the wall.

Walker's Portable Radio

Walker’s unfinished portable radio is slightly larger than a deputy’s hip radio and currently uses a large external battery.

Mining Blast Charges

Walker reports a proposal to rig their side of the tunnel to explode if the dig encounters bad air.

Security is investigating a reported murder in Donald’s silo.

Planning Committee

The planning committee enters the dig claiming Juliette’s authorization and carrying a note from her office.

Lukas reports that a large lottery held during the week pleased a number of residents.

Hank is the deputy of the Down Deep.

Eren wears gray coveralls with his name on the patch.

Deputy Stevens photographs the interior of the bloodstained cryopod.

Microscopic machines in the blood are intended to repair damage from freezing and thawing at the cellular level.

Neighboring Silo Church

Newcomers have found a church in the silo and are gathering food there.

Marsha is Juliette’s assigned assistant and previously served the last two mayors.

Silo Ranking List

A new silo-ranking printout shows that the order has changed again.

The map Charlotte finds depicts the silo layout as circles on a lettered and numbered grid.

Juliette and Nelson use the former cleaning lab to construct suits for a different purpose.

Juliette takes a schematic of the silos from Lukas’s hidden office and marks a route between the generator rooms of Silos 18 and 17.

The generator room is the site of Juliette’s excavation through the silo wall.

Donald imagines a final resting place on the hill overlooking Helen’s grave.

Neighboring Silo Server Room

Smoke stops entering the server room after Juliette and Raph block the hatch with a server tower.

Jimmy remembers Shadow’s claws pressing through his coveralls and his rumbling belly.

The stranger who approaches Elise has a dark beard and bright eyes and wears brown coveralls.

Remmy is Father Wendel’s acolyte.

Doctor Whitmore

According to Darcy, Doctor Whitmore says the identification files are corrupted.

Sample Containers

The air-sampling containers hold paired gaskets and strips of heat tape.

Clear plastic sheets line the airlock walls for Juliette’s outing.

Silo 40 is among the silos listed as N/A in the ranking report.

Sims is the old Security chief and alerts Lukas to the incoming call.

Charlotte estimates that the bunker busters weigh sixty kilos.

Central Staircase

Juliette encounters wary glances from people she knows while climbing the stairwell.

The inner lock is used for Nelson’s precautionary scrub-down.

Silo One Communications Room

Donald uses the communications room for private calls after clearing out the operators.

Church Scripture

The church’s scripture is an ornate gilded book protected by a bent-steel cage on a welded podium.

Tom Higgins identifies himself as head of the Planning Committee.

The Legacy includes accounts of recurring uprisings throughout thousands of years of history.

Neighboring Silo Thirtieth-Level Hydroponics

The children call a tangle of plants in the grow pits the Wilds.

The box marked 3 is used for samples from the dead cleaner’s suit.

The server room is on the opposite side of level thirty-four from the Suit Lab.

Juliette realizes the diggers in Solo’s schematics were drawn to scale.

Charlotte still makes her bed with the precision she associates with the Air Force.

Bernard Holland

Bernard previously guided Lukas’s studies of the Order.

Watching Shirly clean the generator, Juliette imagines Knox doing the same work.

Darcy says the person registered to the bloodstained pod belonged in Deep Freeze rather than the executive wing.

Emergency Barracks

Charlotte sleeps in the barracks near drone control.

IT staff have been reassigned to fill labor shortages left by deaths in the Down Deep and Supply.

Two Younger Boys

The twins eat fish caught as the floodwater retreats.

Juliette stays awake at night listening to Walk’s radio.

Charlotte reports that the world beyond the silos’ damaged region still exists.

A medical technician discovers blood on a cryopod lid while servicing a neighboring pod.

Silo One Level Thirty-Four

Administration is on level thirty-four.

Books burn in Solo’s hiding place beneath the server room.

Lukas has told Judge Picken that Juliette will attend the monthly town hall.

Sophia is a former suit technician.

Charlotte's Pistol

Charlotte carries a pistol taken from a storage bin concealed in a hip pouch.

Reports from previous cleanings fabricated test results to justify fears of the outside.

Cleaning Helmet

The helmet’s internal screen has been removed to provide a clear view of the actual world outside.

The hill air sample leaves the Supply heat tape intact but eats a hole through the IT heat tape.

Hyla is Bobby’s daughter and apprentice.

Inter-Silo Power Lines

Juliette says she has seen the incoming power lines and intends to cut off the power connection.

Mayor’s Apartment

Juliette’s own apartment is on level six.

Mechanical Levels

Juliette’s digging shakes dust from the halls of Mechanical and rattles their pipes.

Mining Excavators

The excavator used by Juliette advances on rusted tracks and drives a hammer bit into concrete.

Neighboring Silo Lower Farms

The children resume tending the grow plots on the lower farms.

Neighboring Silo Mechanical

The drained Mechanical levels remain dark and littered with flood debris.

Silo Collapse System

Donald describes bombs intended to bring down silos if their inhabitants defeat the other controls.

Silo Eighteen Guest Bunkroom

The children receive a small bunkroom, while Jimmy is assigned a private room down the hall.

Silo One Power Plant

Donald says the reactor below them powers the servers.

Surveillance Cameras

Juliette reports that she cut hidden camera feeds weeks earlier.

Walker's Workshop

Walker uses his workshop to construct the portable radio and connect Juliette with Solo.

Darcy obtains an H&K .45 from a sealed armory bin.

Elise’s sister is dead.

George’s death left Juliette devastated for a year.

Juliette's Multi-tool

Juliette carries her multi-tool in a pocket when leaving Mechanical.

Kali is Shirly’s shadow and helps rinse the rags used to clean the generator.

Shirly’s husband has died, and Juliette holds herself responsible.

Monthly Town Hall

The day’s monthly town hall is the first since Juliette’s election.

Charlotte has a note from the Senator that she regards as a suicide pact.

Rite of Initiation

Lukas’s Rite involved imprisonment and compulsory study of the Order’s human-behavior passages.

Seed Solar Panels

The tower has a silvery flat surface jutting upward, partly covered with vines.

Silo One Level Fifty-Four

The warehouse where Charlotte is confined contains spare parts, tools, and emergency rations.

Silo One Security

Only Security and a few top personnel can override access to the armory level.

Silo 12 is among the silos listed as N/A in the ranking report.

People travel from both the Top and the Deep to attend the Mids priest’s warnings about the digging.

The Order includes passages on human behavior that Lukas was required to study during his Rite.

Juliette considers herself and Lukas carrying cargo in silver coveralls a violation of the Pact.

Terry Harlson introduces himself as a member of the Planning Committee.

Gina worked in Supply.

Temple on Ninety-Nine

The temple on ninety-nine occupies space among former hydroponic farms and worker flats that once served the Deep.

Decontamination Tub

Juliette welded the large metal tub used to protect her during the airlock burn.

Deputy Hoyle helps police the Town Hall meeting by ordering residents to sit down and be quiet.

Emergency Personnel Room

Emergency Personnel is the smallest freeze hall.

Gene Sample worked in Sanitation.

Jack Brent was sent to clean nine years earlier after going mad following his wife’s second miscarriage.

Jomeson is an old pump repairman.

Lesley is Erik’s wife.

Michael (medical assistant)

Michael is a medical assistant who helped remove the wounded man from the cryopod.

Neighboring Silo Generator Room

The old generator room is where Jimmy and the children wait for the approaching digger.

Neighboring Silo Sump Pumps

The pump draws from a nearly empty shaft with about a foot of water left.

Raina is Dawson’s wife.

Raylee is a second-shift electrician who is nine months pregnant.

A moving platform in the bunker’s stairwell is put into operation.

Donald says Anna left a note asking for his help in Thurman’s inbox.

Access to the armory level requires a security override.

The bazaar occupies level one-hundred and contains crowds, animals, smoke, and food stalls.

Charlotte's Silo Schematic

Charlotte draws a silo schematic from her brother’s routine and the personnel directory.

Conner (mechanic)

A mechanic says Conner has been digging the tunnel.

Dog Meat Seller

A dog-meat seller claims he paid for Elise’s puppy and offers to accept her book in exchange for it.

Donald's Holding Room

Donald’s prison room has a secure door and no escape route above the ceiling panels.

Donald's Protective Suit

The puffy suit lies beside shears, silvery tape, a helmet, gloves, boots, and a bottle resembling a dive tank.

The Down Deep has very few residents present at the Town Hall meeting.

Emergency Personnel

Emergency Personnel is reserved for extreme situations beyond Security’s abilities.

The survivors spend the night in a wooded camp with tents and fires.

Lottery Committee

The lottery committee requests an official population count.

Neighboring Silo Airlock

Silo 17’s outer door has remained partly open since the silo fell decades earlier.

Neighboring Silo Coroner's Office

The coroner’s office lies below the farms, past the pump rooms.

Neighboring Silo Pump Facility

The pump facility beside the generator room shelters survivors in the light of torches and flashlights.

Neighboring Silo Sheriff's Office

Most bodies in the sheriff’s office are piled near the door as though their owners tried to crawl back into the cafeteria.

Sasha was the only other woman in Charlotte’s boot camp.

Juliette says Shaft Six lies almost directly beneath the excavation.

Silo One Elevators

The lift requires an ID scan before Charlotte can select a destination during her escape.

Silo One Operating Room

The operating room is rarely used.

Silo One Personnel Directory

The personnel directory lists rank, shift assignment, occupation, living level, and work level.

Soil Sampling Tool

Juliette built the soil-sampling tool’s large T-shaped grip while wearing bulky suit gloves to ensure it could be handled outside.

The accounting offices manage spares and supplies.

Airlock Canisters

The supposed argon supply uses a pump and filter said to draw fresh gas from deep underground.

Carol (radio reference)

An unidentified speaker mentions Carol in a radio conversation Charlotte overhears.

The history Lukas reads portrays Castro as a liberator who subsequently enslaved people under a worse system.

The history Lukas reads portrays Cromwell as a liberator who subsequently enslaved people under a worse system.

The crushing room grinds mining tailings into powder and vents them to the exhaust manifold.

Down-Deep Deputy Station

Hank’s deputy station is on level one-twenty.

Donald recalls Erskine arguing that someone would inevitably create a weapon capable of silently exterminating humanity.

Frankie (Mechanical security)

Frankie is in the infirmary after being overrun by the mob at the gates.

The main generator runs more smoothly than it did before its severe imbalance was corrected.

Heat-Tape Blanket

Juliette recalls using Solo’s heat-tape blanket while waiting outside the airlock on her previous return.

The former jail cell is used for further showering after the inner-airlock decontamination.

Nelson fitted Holston for his cleaning.

IT Conference Room

Juliette was told she was mayor in the conference room at IT.

The IT halls resemble those of Silo 17 closely enough to mingle Juliette’s memories of the two places.

Charlotte’s military service in Iraq involved remaining confined to base amid a dangerous desert environment.

Father Wendel locates and reads Isaiah in the scattered scripture pages.

Juliette remembers that Mayor Jahns was poisoned on the IT level.

Jimmy retrieves the black rifle from above an apartment’s ceiling panel.

According to Raph, Jonny objected that Gina remembered the inventory estimates that fit her theory and forgot those that did not.

Judge's Chambers

The judge’s chambers contain an old leather chair repaired with tape.

Juliette's Diving Suit

Jimmy finds the plastic dome of Juliette’s helmet among debris at the bottom of the stairs.

The history Lukas reads portrays Lenin as a liberator who subsequently enslaved people under a worse system.

Lukas's Apartment

Lukas’s apartment has become a familiar second home for Juliette.

Lukas's Star Chart

Lukas used his star chart while discussing the possibility of other worlds with Juliette.

Courtnee promises Jimmy and Elise sweetcorn prepared by Mama Jean.

Mechanical Classroom

Juliette sends Raina to the classroom to collect the children for evacuation.

The Mids section at the Town Hall meeting is half full.

Milgram appears among the human-behavior accounts that Donald has encouraged Lukas to treat as more than fiction.

Juliette proposes removing girders from the mines to brace the tunnel.

Nano Treatments

Donald says cryopods contain machines that repair and preserve people.

The history Lukas reads portrays Napoleon as a liberator who subsequently enslaved people under a worse system.

Neighboring Silo Deputy Station

The lower deputy station’s radio charging rack is disconnected from the makeshift power supply.

Neighboring Silo IT

Juliette and Raph find the IT doors on level thirty-four unlocked and the lights on.

Neighboring Silo Level Fifty-One

Jimmy remembers hiding a rifle on level fifty-one, wrapped in a quilt inside an old trunk.

Neighboring Silo Level One-Eighteen

Jimmy remembers that the lower rifle stash is on level one-eighteen rather than one-nineteen.

Neighboring Silo Level One-Twenty-Two

Jimmy encounters Terry at the landing on level one-twenty-two.

Neighboring Silo Seventy-Five Deputy Station

The deputy station on level seventy-five is where Tom Higgins answers Charlotte’s call.

Neighboring Silo Staircase

An emergency light is out on the landing from which Jimmy and Elise begin their descent.

The oil rig continues operating amid excavation rubble during the evacuation.

One-Hundred-Twenty-Sixth-Floor Dirt Farm

Juliette stops for food at the lower farms on level one-twenty-six.

Operation Fifty of the World Order

Lukas identifies silo eighteen as part of World Order Operation Fifty.

Peter Nichols's Makeshift Clinic

Juliette’s father has made a clinic in a cleared-out, rusted storeroom.

Population Control

Population Control originated many of Donald’s reports.

Many porters search for Elise at Juliette’s direction.

Juliette proposes a slight power holiday to avoid running the main generator at full load.

Lukas reports that a priest in the Mids holds two Sundays weekly to warn that digging could fill the silo with deadly dust.

Puppy (constellation)

Elise names a group of stars Puppy, with Juliette’s agreement.

Records logs major events in every silo and enters them into the servers.

Rickson's Brother

Rickson reportedly believes he had a brother, without confirmation from his father.

Robber Cave Experiment

Donald has helped persuade Lukas that the account of the Robbers Cave boys describes real events.

Lukas wants to ask Donald about Rousseau during their discussion of the Legacy.

Roy is the boy advertising dog meat whom the stallholder calls to restrain Elise.

Raph identifies Gene Sample as someone from Sanitation.

Juliette credits Scottie with helping her survive her own cleaning.

Second Iranian War

Charlotte was stationed in Iraq during the Second Iranian War.

Darcy thinks he belonged to the Secret Service after briefly serving in the army.

Lukas reports visible buildup on the sensor view during Juliette’s mission.

Lukas connects Sims to the remote caller through the server headset.

Sheriff's Office

The sheriff’s office serves as an observation and radio station for the return decontamination.

Silo One Level Forty-Two

The hallway on level forty-two is dim and empty when Eren calls for help.

Silo One Level Sixty-Eight

The operating room is on level sixty-eight.

Silo One Medical

The medical office holds Anna’s and Eren’s bodies while Whitmore and two technicians work.

Silo One Security Level

The directory places a security officer’s workplace on level twelve.

Silo Seventeen Key

Jimmy wears his old key when leaving the server room and checks for it in the tunnel.

Silo Seventeen Security Radio

The radio in Solo’s hiding place no longer powers on after the fire.

Silo Six has returned to the top of the ranking list.

Erik proposes Silo Sixteen as a destination he estimates could be reached in two weeks.

Donald says Silo Ten was shut down after broadcasting on general channels.

Solo says his father hid him away to protect him during the silo’s collapse into violence.

Solo's Paper Parachutes

Jimmy finds the small metal washers that anchored his paper parachutes among the flood debris.

The survivors take shelter at Supply on level one-ten after the confrontation.

Supply Lightbulb Storehouse

According to Raph, the lightbulb storehouse is about half empty.

Temple on Twenty-Eight

The temple on twenty-eight established the satellite congregation on ninety-nine.

The meeting room’s aisles divide its benches into three sections corresponding to the silo’s regions.

Up Top’s central section at the Town Hall meeting is full, with additional residents standing behind the benches.

Donald remembers that Victor, the head of heads, shot himself over an uprising in silo eighteen.

Dozens of people watch Juliette’s outside mission on the cafeteria wallscreen.

Juliette was sent outside without cleaning pads.

unidentified character

unidentified character appears among the human-behavior accounts that Donald has encouraged Lukas to treat as more than fiction.