One of the standout elements of "Silo" is its fully realized, tactile set design. The underground bunker feels both vast and claustrophobic, dominated by a monumental concrete stairwell that winds through the silo's core. This is a notable departure from the books, which describe a metal staircase. Author Hugh Howey addressed this creative decision in a Reddit AMA, revealing practical and artistic motivations behind the switch.
"For one, metal stairs would be an acoustic nightmare for production," Howey explained, highlighting a common challenge in filmmaking. Beyond sound considerations, the primary reason was to make the staircase significantly larger while still being feasible to construct. The sheer scale required for the screen necessitated a different approach.
The Stairwell's Pivotal Role in Silo's World
Howey further elaborated on the impracticality of adapting the book's narrow stairwell. In the novels, it barely accommodates two people, making it virtually impossible to film meaningful scenes or capture the necessary visual scope for television. "That would make it almost impossible to shoot anything meaningful on them. And they would basically disappear on the screen," he noted, concluding that "Metal is better for the books. Concrete is better for the TV show."
In the written medium, the metal stairwell serves a distinct narrative purpose, with the sounds of footsteps conveying the silo's collective mood—a cacophony signaling commotion, silence indicating fear. The visual nature of television, however, allows the show to convey these emotional states through direct observation of the characters and their actions, eliminating the need for an auditory substitute.
Within the "Silo" universe, elevators are strictly prohibited, ostensibly due to concerns about long-term maintenance and material scarcity over centuries. Yet, as recent seasons have hinted, this lack of vertical transport, combined with a stairwell that physically segregates inhabitants by levels and social standing, likely serves a deeper purpose: social control. Whether constructed from metal or concrete, the stairwell remains a crucial element in maintaining the silo's mysterious order and its inhabitants' separation, echoing themes of social experimentation seen in works like "Fallout."