Gabrielle waits for her secret informant nervously at the East Appointment Gate of the White House. She has followed instructions to meet an unknown contact at 4:30 pm alone, but by 4:45, no one has arrived. As she grows impatient, Gabrielle is unexpectedly summoned inside by a Secret Service agent.

In the Arctic habisphere, Tolland delivers the finished documentary video disk to the NASA media team. Emotionally drained, he reflects on his past and his late wife, Celia. Tolland and Celia fell in love in graduate school and got married soon afterward, with Celia working aboard a geology research ship. NBC approached Tolland about hosting a documentary series before Celia fell ill with incurable lymphoma; Tolland then abandoned the deal entirely to care for Celia, and after her death, he threw himself back into Amazing Seas—his program—to cope with his grief. 

Drawn to the now-deserted meteorite extraction site, Tolland notices a peculiar, pulsing, greenish bioluminescence shimmering on the surface of the meltwater. Elsewhere, Rachel concludes her briefing with the president’s staff, who are now confident that the discovery ensures their election victory. Reflecting on her father’s past transgressions, Rachel feels like he deserves his impending political ruin. She looks for Tolland and spots him standing dangerously close to the extraction pit. Along with Corky, she heads over to Tolland.

At the meteorite extraction shaft, Tolland shows Rachel and Corky that the water is filled with glowing specks. He identifies them as bioluminescent dinoflagellates, a type of ocean plankton. Their presence is inexplicable, as the meteorite was encased in ancient freshwater glacial ice. Both Corky and Tolland explain to Rachel that she’s not standing on frozen land, as she has believed, but an ice shelf, a massive glacier floating on the Arctic Ocean. 

Tolland tentatively theorizes that the only way for the ocean plankton to have entered the freshwater shaft is through a deep fissure in the ice shelf, allowing seawater to seep in. This contradicts geologist Norah’s important findings that the ice was solid, a fact used to date the meteorite. Tolland sends Corky to find Norah and Ming to investigate the anomaly.

Gabrielle expected a covert meeting but is instead officially processed through security, complete with a photo ID, a signature in the guest log, and an escort in plain view of tour groups. The Secret Service agent leads her through restricted areas, including the Map Room, and into the West Wing. She’s shown into a dim, unmarked office where she’s stunned to recognize the familiar face of the person who has been sending her the secret emails. 

Meanwhile, back on the Milne Ice Shelf, as Tolland performs a simple test on the water in the excavation shaft, the observing Delta-One recognizes that the scientists’ discoveries are creating a serious problem and contacts his controller.

At the meteorite extraction site, Tolland and Corky are unable to show the bioluminescence to a highly skeptical Norah, as the short-lived plankton have died. Norah logically debunks their theory of a fissure connecting the shaft to the ocean, pointing out that since the ice shelf is above sea level, gravity would cause water to flow out of the shaft, not into it. To prove her point, she agrees to test the water. To her astonishment, her refractometer shows that the water is a 3% saltwater brine, and a microscope reveals the presence of dead ocean plankton. This discovery directly contradicts her own and NASA’s data, which concluded that the meteorite was sealed in a pristine freshwater glacier. When NASA Administrator Ekstrom arrives, he’s informed of the contradiction and angrily dismisses it as impossible, insisting that scans proved that the ice was a solid, sealed matrix.

Rachel proposes a theory to explain the saltwater and living plankton in the meteorite shaft: The glacier contains frozen pockets of brine, or interstices, with hibernating plankton that were thawed during the meteorite’s extraction. Tolland confirms that some plankton species can hibernate in ice. Ekstrom admits that the PODS satellite wouldn’t have been able to distinguish the slight density difference between fresh ice and brine ice from orbit.

However, Norah dismisses the theory, stating that such interstices only form in seasonal ice, not ancient fast ice like the Milne Ice Shelf, and her core samples would have detected them. Rachel counters that any flaw in NASA’s data, no matter how small, could discredit the entire discovery, including the fossils. To settle the debate and prove that her data is correct, Norah proposes that she go out on the glacier and test for sea water. Despite Ekstrom’s concern about the raging katabatic wind, he agrees to let her go 200 yards out onto the glacier to conduct her test, ordering a reluctant Tolland to accompany her for safety. When Rachel insists that she wants to join Nora’s mission, Ekstrom says that Corky must also accompany her, making the group a secure quad.

Gabrielle’s anonymous informant turns out to be White House Advisor Marjorie Tench. Tench says that she leaked information to Gabrielle so that Sexton would clarify and solidify his anti-NASA message, which will ultimately be proven wrong. Tench then explains the long-standing political battle over the Space Commercialization Promotions Act, a bill that would privatize NASA. She argues that privatization would be catastrophic, ending scientific discovery in favor of dangerous, profit-driven ventures, and that the president’s veto power is the only thing preventing it. 

Expressing her fear that Sexton would support the bill if elected, Tench’s tone becomes menacing. She questions Sexton’s campaign spending and insinuates that Sexton has run through the fortune he inherited from his wealthy deceased wife. 

Tench retrieves a thick manila envelope from a safe and presents financial records to Gabrielle to prove that Sexton is broke and is accepting huge, illegal campaign bribes from aerospace companies that would benefit from NASA’s privatization. If Gabrielle continues to support Sexton, she could be legally implicated. When Gabrielle tries to end the meeting, Tench presents more documents.

Meanwhile, in the Arctic habisphere, Norah outfits Rachel, Tolland, and Corky in Mark IX survival suits for an expedition onto the ice. During the preparations, Rachel confides in Tolland about her lifelong fear of water, which began after she fell through ice as a child. Tolland tells Rachel that he understands and invites her to visit his research vessel, the Goya, to help her overcome her fear.

Gabrielle is shown documents, photos, and memos that appear to prove that Senator Sexton is accepting illegal campaign funds from private space companies through the Space Frontier Foundation (SFF). Gabrielle doubts the evidence is real, questioning why the White House would keep such damaging information secret. Tench claims that President Herney wants to avoid a negative campaign and the widespread scandal that would result from exposing Sexton’s corruption.

Instead of leaking the financial documents, Tench offers Gabrielle a deal: She can prevent the larger scandal and earn a position with the president’s team if she publicly admits to having an affair with Sexton. Tench argues that this would discredit the senator in a more “contained” way. Believing that there’s no proof of her single encounter with Sexton, Gabrielle calls Tench’s bluff and refuses. Tench confidently retrieves another folder from her safe, implying that she has evidence of the affair.

Norah leads Tolland, Rachel, and Corky out of the habisphere and onto the glacier. They face an intense, 80-knot katabatic wind in the dark. Tolland feels uneasy about the powerful, unceasing gale pushing them down the slight incline of the ice shelf toward the ocean, finding Norah’s brief safety instructions on using an ice ax to be inadequate. The four are roped together in a line, with Norah in the lead, followed by Corky, Rachel, and Tolland serving as the anchor. Feeling a sense of responsibility for the others, Tolland questions the risk of having all four of them out in the dangerous conditions. Norah navigates by following a heavy gear sled that glides downhill in front of her.

A mortified Gabrielle storms out of Tench’s office after being shown authentic photographs of herself and Senator Sexton engaged in a sexual act in his office. The images appear to have been taken by a hidden camera. Tench catches up to Gabrielle and presents an ultimatum: She wants Gabrielle to sign an affidavit admitting to the affair. Tench explains that since Sexton has already lied to the American people by denying their relationship, this signed statement would give the White House leverage to handle the senator quietly, thus sparing the country a public scandal. In return for her cooperation, Tench promises that the photos will never be made public. Gabrielle refuses, calling the idea “crazy,” but Tench warns that the senator will be taken down one way or another.

Rachel, Tolland, and Corky follow Norah onto the ice sheet, with Nora planting flares at intervals in the ice to guide them back. Norah wants to use ground-penetrating radar (GPR) to prove that the ice around the meteorite is solid freshwater. As they set up the GPR, both Rachel and Norah separately notice a distant guide flare being momentarily obscured, creating a sense of unease. Norah performs the scan, and the machine produces a printout. The group gathers to see the results. The printout delivers two shocks: First, Ming’s body is visible floating head-down in the water-filled meteorite extraction shaft; second, tracing downward, the data reveal a dark column of sea ice extending from directly beneath the shaft all the way to the ocean, proving that the meteorite tunnel continues through the ice shelf. Norah collapses to her knees, trembling, and then screams toward the habisphere in rage.

After Delta-One covertly reports, “They know,” Tolland and Rachel examine Norah’s GPR printout. Norah furiously deduces that a submersible drilled up from under the ice shelf and planted the rock, a deception confirmed by the presence of recently trapped plankton. Resolved to expose the fraud to the president, Norah plans to drill a new core sample from the shaft bottom to prove that it contains saltwater ice. As the group starts back toward the habisphere, an unseen assailant opens fire. Norah is struck and knocked unconscious, and Corky is wounded. Taking cover behind their sled, Rachel and Tolland are pelted by projectiles.

Rachel recognizes the projectiles as experimental military weapons, concluding that they’re being attacked by a US Special Ops team and have little chance of survival. She’s struck by one of the projectiles and falls, urging the others to run.

Gabrielle rides the subway after her meeting at the White House, carrying the envelope from Tench containing compromising photographs of herself and Senator Sexton. She attempts to call Sexton but is informed by his secretary that he has blocked off the evening for a “Personal Event” and is completely unreachable. While considering her predicament, Gabrielle has an epiphany: Without her public admission, Sexton could easily dismiss the photos as deepfake forgeries. This is why Tench was so insistent about Gabrielle herself disclosing the affair. She begins to suspect that the bribery evidence that Tench showed her might also be fake, part of a desperate White House bluff to pressure her into betraying the senator. Reconsidering the entire situation, Gabrielle decides that she must speak to Sexton immediately, resolving to go to his residence in person.

Pinned down on the ice, Tolland, Rachel, Corky, and an unconscious Norah are approached by three armed figures in white suits. The Delta Force team kills Norah by stuffing snow down her throat, a technique called “white death” that’s intended to make her death look like an accident from exposure. 

As they move to kill Corky next, Tolland desperately searches for a weapon among the sled’s scattered equipment. He finds only a Mylar weather balloon, initially dismissing it as useless without a helium tank. A sudden memory of spinnaker sailing inspires a desperate plan: He can use it as a wind sail. Tolland clips the balloon to his and Rachel’s harnesses. He then releases the balloon into the gale-force wind, which instantly inflates it like a massive sail. The force yanks Tolland, Rachel, and the still-tethered Corky across the ice, pulling them away from their stunned assailants and toward the edge of the glacier.

Tench heads to the White House Communications Office. She’s hopeful that she will secure an affidavit from Gabrielle admitting to an affair with Sexton, which would serve as a “character” attack on the senator. Tench plans a two-pronged “high-low” assault on Sexton, combining the character attack with a political one: the president’s upcoming press conference revealing a major NASA triumph, which will undermine Sexton’s campaign platform. At the Communications Office, she finds the staff poised to send out a “flash release” announcing the president’s urgent and classified eight o’clock press conference to global media outlets. Confident in her strategy, Tench prepares for the first strike to be launched.

Rachel, Tolland, and Corky are dragged uncontrollably across the ice sheet by powerful winds, racing toward the ocean cliff. Tolland discovers that he can’t release the payload clasp connecting them because the intense tension prevents the safety clips from opening. Their joint attempt to create slack by digging their crampons (spikes attached to climbing shoes) into the ice fails when Rachel’s crampons snap off. As the trio approaches three large snow berms standing between them and the sea, Rachel remembers her ice ax and begins sawing at the taut nylon cord. Tolland joins her, and they work together as they’re pulled toward the berms or ice ridges. Upon hitting the first berm, they’re launched violently into the air. Just as they fly over the trough between the first two berms, the frayed rope snaps. The balloon spirals away, and Rachel and Tolland fall from the air, crashing down onto the far side of the second berm, tumbling over the third, and falling over the edge of the glacier.

In Washington, DC, Gabrielle goes to Sexton’s apartment. Using an empty envelope with a White House seal, she bluffs her way past the doorman and the senator’s security guard, claiming that she has an emergency message that must be hand-delivered. Once inside the apartment, she discovers several briefcases in a closet belonging to private aerospace companies like Space America and Beal Aerospace. This discovery appears to confirm Tench’s accusation that Sexton is accepting bribes. Gabrielle quietly approaches the den to eavesdrop on Sexton’s meeting with the aerospace executives.

Tolland wakes up to see that their group has fallen onto an unstable terrace of ice on the verge of calving from the main shelf. As Tolland confirms that Corky and Rachel are alive but battered, two Delta soldiers appear on the edge of the glacier above them. Realizing that the fugitives are trapped on the precarious ice block, Delta-One throws a timed concussion grenade into the deep fissure separating the terrace from the glacier. His plan is to sever the ice block completely, plunging the three into the ocean and ensuring that their bodies are never found. The soldiers then retreat to a safe distance to watch the grenade detonate.

A powerful concussion shatters the ice beneath Rachel, Tolland, and Corky, shearing their section of the glacier from the main shelf. They plummet into the frigid Arctic Ocean on the newly formed iceberg. The massive slab submerges, dragging them underwater before it violently resurfaces, throwing them into the churning water on its surface. As the seawater pours off the edges, Rachel is swept toward the side but is saved when her tether, connected to Corky, pulls taut. She discovers that Tolland is also alive nearby.

From the cliff above, Delta-One spots the three survivors huddled on the iceberg as it drifts out to sea. Believing that they will quickly perish from exposure in the harsh conditions, he concludes that they pose no further threat. He lies to his partner, claiming that he saw only shadows, and orders his team to leave, abandoning Rachel, Tolland, and Corky to their fate on the floating ice.

In his apartment, Senator Sexton meets with six executives from private aerospace corporations. He makes a political pitch, arguing that NASA is an inefficient and anti-competitive monopoly. Sexton details how NASA uses taxpayer money to intentionally price its services at massive losses, effectively undercutting private companies and driving them out of the market—a strategy that one executive calls the “Wal-Marting of space” (202). He also condemns federal laws, influenced by NASA, that ban corporate sponsorships on private space vehicles, depriving the industry of essential funding.

Sexton and the executives agree that the biggest obstacle to privatizing space is the public’s romanticized perception of NASA, which they attribute to Hollywood propaganda and publicity stunts. Sexton promises that if he’s elected president, he will abolish this anti-sponsorship legislation. He will also privatize space exploration and turn it over to the free-market system. 

Gabrielle secretly listens to Sexton’s entire proposal, standing 15 feet away from his office.

At the habisphere, a panicked NASA technician finds Administrator Ekstrom and reports a fatal accident. The technician reveals that Dr. Ming’s body has just floated to the surface in the extraction pit. To prevent the news of Ming’s death from overshadowing the imminent press conference and damaging NASA’s reputation, Ekstrom orders the body hidden and the death kept secret.

Meanwhile, adrift on an ice floe, Rachel’s group is succumbing to hypothermia. Rachel suspects Ekstrom of being behind the attack but can’t determine what anyone would gain by inserting the meteorite. She wonders whether Herney is a coconspirator or an unknowing pawn. Accepting that rescue is impossible, Rachel focuses on getting the GPR printout from her pocket into the hands of the NRO. She uses her ice ax to pound an “SOS” signal into the ice, knowing that it will be detected not by civilian arrays but by the NRO’s secret, global underwater listening network.

In the Oval Office, President Herney prepares for a major television address, scheduled to occur in one hour. He speaks by phone with Ekstrom, who’s at the habisphere. Herney senses that something is wrong with Ekstrom’s tone, but the administrator reassures him that everything is ready for the broadcast. Herney dismisses his concern, believing that Ekstrom is simply exhausted.

Meanwhile, on the Milne Ice Shelf, the Delta Force soldiers regroup. After learning that Rachel, Tolland, and Corky went over the side of the ice shelf, they realize that their original plan to stage an accident with four bodies is no longer viable. Delta-One orders a “clean sweep” to erase all evidence of their presence. The soldiers collect their flares and other gear and then push Norah’s body and her entire equipment sled off the cliff into the Arctic Ocean. As they depart, the wind erases their tracks from the snow.

The nuclear submarine Charlotte, a state-of-the-art Los Angeles-class vessel, has been stationed on a highly classified mission in the Arctic Ocean for five days. The submarine is described as immense, stealthy, and capable of long-term submersion thanks to its nuclear reactors. In the sonar room, a world-class technician is monitoring the vessel’s surroundings. He detects a dull, repetitive echo that, while easily distinguishable, is completely unexpected. The technician informs the captain that the thudding is coming from the surface.

After overhearing Sexton’s meeting, Gabrielle is convinced of his corruption and realizes that she can no longer support him. When a man in the meeting receives a phone call, Gabrielle learns of a surprise presidential press conference scheduled for eight o’clock that evening. She connects this to Tench’s deadline and understands that the White House is about to make a major move against Sexton. Deciding on a course of action, Gabrielle leaves with an envelope of photos and directs a cab to the ABC television studios.

Lying on a floating raft of ice, Tolland can feel his body shut down from the cold. He can no longer feel his limbs, his breathing is shallow, and his vision blurs as his eyes begin to freeze. As they drift farther from the Milne Ice Shelf, the wind calms, and Tolland notes that Rachel and Corky have fallen silent. Resigned to his fate and feeling a sense of floating numbness instead of pain, he accepts that he’s dying. In his final moments on the brink of unconsciousness, Tolland doesn’t hallucinate a rescue but instead sees a terrifying vision of a leviathan rising from the sea next to their ice raft.

Gabrielle goes to the ABC News office to seek help from her friend and mentor, news editor Yolanda Cole. The newsroom is in a frenzy over an imminent, mysterious presidential press conference. In private, Gabrielle confesses everything to Yolanda: her affair with Sexton, Tench’s blackmail attempt, and her discovery of Sexton’s illegal campaign financing from the SFF.

Unfazed by the scandal, Yolanda advises Gabrielle that confessing would be political suicide. She argues that a president would never use a global press conference to announce such allegations, suggesting that Tench was bluffing to scare Gabrielle into turning on her boss. While they’re talking, Yolanda receives an internal tip that the president’s announcement is NASA related. Yolanda assures a relieved Gabrielle that the press conference isn’t about her and advises her to wait and watch it unfold.

Rachel awakens in a small, tiled room in the submarine, feeling as though she’s being burned alive by scalding rain. Lying on the floor in only her underwear, she’s held down by men in blue jumpsuits who pour water on her to warm her freezing body. One man, speaking with a professional American accent, explains that the water is merely lukewarm and that the burning sensation is caused by blood returning to her muscles after severe cold exposure. 

As memories of the attack on the ice shelf return, she wonders where Michael and Corky are and then spots them on the floor as well, being sprayed with the warm water. The intense burning sensation gives way to a deep, muscular aching. The man instructs her to move her limbs despite the excruciating pain. Just as she feels like she can’t endure it any longer, she’s given an injection. The pain quickly subsides, replaced by the feeling of pins and needles as she slowly regains sensation.

Rachel, Tolland, and Corky are moved to a medical deck where they’re warmed and given adrenaline injections. Rachel learns that they have been rescued by the crew of the USS Charlotte, a Navy submarine. The vessel’s commander, Captain Harold Brown, recognizes Rachel by name from her intelligence work at the NRO. Rachel silences Tolland before he can speak about the meteorite, aware of security clearance protocols, and instead demands to speak privately with her boss, William Pickering. 

However, upon seeing a clock, she’s stunned to realize that it’s only 7:51 pm Eastern time. Knowing that the president has not yet held his press conference, she realizes that she still has time to stop him from making the false announcement. She immediately changes her demand, telling the skeptical captain that she must speak to the president of the United States right away.

Rachel manages to contact a switchboard operator in the White House and urges him to connect her with the president. As the operator races to deliver a cordless phone to the president, he’s intercepted by Tench. Tench takes the call herself, expressing disbelief that Rachel is using an unsecured line.

Rachel frantically explains that the meteorite data is fraudulent, revealing that the rock was inserted from beneath the ice shelf, and warns that NASA’s administrator may be responsible. She also reports that Norah and Ming have been killed. Tench dismisses Rachel’s desperate warnings, accuses her of using the unsecured line as a political stunt, fires her from her White House post, and threatens defamation charges if she continues. The line goes dead, leaving Rachel unable to warn the president.

Herney begins his live, globally televised press conference. He feels a sense of unease, recalling an angry phone call he saw Tench having just moments before he took the stage. On Ellesmere Island, Ekstrom waits for his cue, feeling a “cavernous shame” for endorsing lies.

While watching from different locations, Gabrielle fears that the broadcast will expose her personal scandal, while Sexton and his financial backers expect Herney to announce a NASA failure. Instead, the president reveals that NASA has discovered a meteorite in the Arctic containing unequivocal proof of extraterrestrial life in the form of fossils. He shows an image of a fossil and introduces Ekstrom via satellite, who praises the discovery. The news leaves Senator Sexton devastated, as his anti-NASA campaign is instantly ruined.

Furious after an unexpected phone call from Rachel, Tench preemptively calls Pickering. Tench tells Pickering that Rachel, after endorsing the data earlier, is suddenly making absurd allegations of fraud. Tench suggests that Rachel’s motive might be tied to her father’s presidential campaign. 

Pickering defends his employee, finding it hard to believe that Rachel would make such claims without a good reason and noting that she’s not close to her father. Tench reveals that Rachel hasn’t yet returned from the Milne Ice Shelf and warns Pickering that the White House has a videotape of Rachel’s initial, complete endorsement of the meteorite data, implying that they will use it to ruin her credibility if she proceeds.

Just after Tench hangs up, Pickering is stunned to learn that Rachel is calling him on an encrypted audio-visual stream from the submarine Charlotte. He hurries to a conference room to take the call.

Aboard the submarine, Rachel, Tolland, and Corky are inside a secure, soundproof anechoic chamber known as the “dead room.” This chamber is designed to make their conversation completely impossible to intercept as they prepare to speak with Pickering. Rachel connects with Pickering and tells him that there’s a “serious problem” with the meteorite.