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Langdon follows Vittoria and Kohler back through CERN’s atrium. Vittoria moves with controlled, deliberate breathing, seeming to manage her grief through discipline, and Langdon wants to comfort her because he remembers the shock of losing his own father unexpectedly as a child.

Langdon’s thoughts drift to his father’s funeral and to a childhood Christmas gift: a delicate glass rose meant to remind his father to slow down. When his father placed it on a high, dark shelf and never noticed Langdon later returned it, the memory reinforces Langdon’s sense of emotional distance and loss.

An elevator interrupts Langdon’s memories. Kohler explains that Leonardo Vetra’s lab is underground, forcing Langdon into a cramped descent that makes him uneasy. As the elevator drops six stories, Langdon notices the destination marked LHC and learns it stands for Large Hadron Collider, a particle accelerator.

Langdon recalls a Harvard dinner where physicist Bob Brownell angrily described the canceled American Superconducting Super Collider and explained that particle accelerators smash near-light-speed particles to reveal the universe’s basic components. The memory helps Langdon understand the purpose of the machine, though he remains unsettled by its scale and the idea of being buried underground.

At the bottom, Langdon enters a vast cement tunnel and feels claustrophobic, haunted by a childhood memory of being trapped in darkness. Vittoria walks ahead into the tunnel while lights activate before her and shut off behind the group. Kohler points out the accelerator tube along the wall and explains that although it appears straight, it is actually part of an enormous circular machine.

Kohler reveals that the LHC is the largest machine in the world: over eight kilometers in diameter and twenty-seven kilometers long, extending into France before looping back. Langdon is stunned that CERN moved such vast amounts of earth to collide tiny particles, and Kohler frames the effort as the price of discovering truth.