Supervolcano

Richard Lieberman, the scientist in charge of Yellowstone Volcano Observatory, leads a press conference with his colleagues Jock Galvin, Dave, Matt and Nancy, and their boss, Michael Eldridge, to present their new virtual imagery simulator VIRGIL, which Eldridge claims will greatly aid their research. The gathering is brisk, professional, and aimed at reassuring the public that they are prepared for any eventuality, even as a wary reporter in the room—Maggie Chin—asks about the possibility of an eruption. Rick dismisses the notion as a remote possibility, trying to keep the mood calm and focused on science rather than fear.

Soon after, an earthquake triggers a tsunami on one of the park’s lakes, and Maggie interviews Kenneth “Ken” Wylie on TV about his new book on volcanoes. Rick and Ken are brothers-in-law, and their later exchange grows tense as Rick accuses Ken of exploiting public anxiety to sell his book. The tension underscores a central tension in the film: the difference between keeping the public informed and managing the sensational narratives that can spiral into mass panic.

Meanwhile, the undersecretary of FEMA, Wendy Reiss, presses Rick for a hard look at worst-case scenarios if Yellowstone were to release a “super eruption.” He shares a sobering simulation that shows the potential reach of an ashfall across the United States, a visualization that raises the stakes for everyone involved. The moment crystallizes the stakes: even a routine hydrothermal event at Norris Geyser Basin can ripple outward as questions pile up from a growing crowd of reporters and viewers.

As the team runs more simulations on VIRGIL, they learn that even a moderate eruption could destabilize the broader magma chamber beneath Yellowstone and potentially trigger a much larger event. The possibility shifts from theoretical to immediate concern, prompting heightened vigilance across the park and in federal offices. Seismic chatter grows louder, and the ground begins to feel unsettled enough that the park’s authorities decide to close it for safety. Maggie persists, arriving at the park anyway, while Rick dispatches Matt to give her a guided tour that doubles as a data-gathering exercise. The team detects a harmonic tremor near Norris, a sign that an eruption of uncertain scale could be imminent.

News of the tension and the new danger leaks to the press, stoking a national panic. FEMA schedules a crucial press conference in Washington, DC, where Rick is pressured to downplay the threat and assure the public that the eruption will not be large. The scene highlights the strain between scientific caution and political expediency, a recurring theme in the film. As Rick travels back from the conference, the field office finishes tallying the latest data. They uncover troubling evidence: the top of the magma chamber contains enough eruptible magma to destabilize the chamber and trigger a super eruption. The realization hits with devastating clarity as the team rushes to interpret the new data and plan for what comes next.

The eruption begins in earnest, tearing through the landscape with frightening speed. The field office is severely damaged, and Jock is injured in the chaos. Matt investigates the eruption and contacts Dave to relay the news to Rick. A pyroclastic flow forces the team to abandon the main USGS office; Nancy and Matt try to outrun the advancing cloud in a truck, but the flow overwhelms them, and they are killed in the resulting devastation. The ash plume and tremors force a rapid reconfiguration of emergency response, with FEMA widening its protective measures and airspace closures as a precaution for thousands of travelers and residents.

Rick reaches out to Dave, who had relocated earlier to establish a backup office in a hotel in Bozeman. Meanwhile, the vent system drives ash east across the United States, closing major air routes and pushing authorities to seek shelter and containment. Rick’s plane fights its way through the ash and makes an emergency landing in Cheyenne. He and Ken decide to move toward a FEMA facility in Denver, but the ash renders those plans impractical, forcing them to seek a nearby military installation instead.

The eruption drives a dramatic collapse of structures as the ashfall intensifies and the venting continues. The motel roof collapses, destroying the backup office and killing Dave. Rick and Ken manage to reach a secure military installation, where they weather the worst of the event. Inside the installation, Rick coordinates with FEMA and pieces together the forecast: the vents will merge into one massive caldera, unleashing an eruption on the scale of the Huckleberry Ridge Event—the most dramatic chapter in Yellowstone’s long history.

As officials scramble to devise a plan to save the estimated 25 million people trapped by ash, Rick argues that evacuation by air is impractical and nearly impossible given the conditions. He pushes for a stark, grim approach: FEMA initiates the Walk to Life program, urging people to walk through the ash to safety rather than waiting for a risky airlift or relief operation. The approach is controversial but holds a grim logic given the scale of the disaster unfolding around them.

A week into the eruption, the ground above the emptied magma chamber begins to sink, signaling that the eruption is nearing its end. Yet the damage is already extensive, and much of the US must endure a volcanic winter, with atmospheric conditions rendering large portions of the country uninhabitable. The crisis claims lives and reshapes how the country thinks about natural disaster response. In the end, the Walk to Life program manages to save around 7.3 million people out of the original 25 million trapped, including Rick and Ken, whose resilience and teamwork underscore the human capacity to endure even the most cataclysmic events. The film closes on a somber but hopeful note, emphasizing caution, preparedness, and the quiet courage of those who confront extraordinary danger.