Fabula
Object
Object

Central Shaft Rock Fall Hazards

Actualized rock fall debris blocking the Central Shaft tunnel after being triggered by tampering with Cyberman technology
2 appearances

Purpose

Improvised structural collapse for immediate tunnel obstruction

Significance

The uncontrolled rockfall nearly buries the Doctor and Harry alive, exposing Harry’s reckless incompetence and fracturing their already fragile alliance. The crisis underscores the lethal consequences of improvising with unfamiliar alien technology during a critical mission against the Cybermen.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S12E19 · Revenge of the Cybermen Part 3
Doctor triggers shaft cave-in to trap Cybermen

The precarious pile of rocks at the top of the Central Shaft serves as an improvised trap when dislodged deliberately by the Doctor. Acting as an immediate countermeasure, the cascade of jagged stones seals the shaft, cutting off the Cybermen’s path and preventing their advance into the lower reaches of the shaft. The rocks' fall disrupts the enemy’s movement unexpectedly.

Before: Loosely stacked at the top of the Central Shaft, precarious and unstable
After: Collapsed chaotically downward, forming a barricade that seals the shaft
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S12E20 · Revenge of the Cybermen Part 4
Doctor uncovers Harry's rockfall sabotage

The booby-trapped Cyberman buckle, properly opened only by a Cyberman signal, was violently pried open by Harry Sullivan. The buckle's premature release mechanism triggered an immediate partial rockfall in the Central Shaft, burying escape routes and creating immediate life-threatening hazards from unstable basaltic rock.

Before: Firmly sealed Cyberman buckle with a booby-trap requiring a specific Cyberman signal to open safely
After: Tampered buckle forcibly pried open, triggering immediate rockfall that destabilized the surrounding shaft infrastructure
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