Object

Castrovalva's Hidden Entrance Mechanism

Concealed cliffside entrance activated by instinctive guidance, allowing access to subterranean corridors beneath the Citadel

2 appearances

Appearances in the Narrative

When this object appears and how it's used

2 moments

S19E3 · Castrovalva Part 3

Exhausted companions reach Castrovalva’s gate

The massive rock doors, carved directly into the cliffside, serve as both entrance and prison in this moment. As Tegan and Nyssa reach their jagged threshold, the doors begin their final ponderous slide shut at Mergrave's command, sealing the companions outside with a thunderous finality. Their rough stone surfaces dig into the women's palms, marking both physical resistance and symbolic obstruction.

Before: Closed but not yet fully sealed; capable of being reopened or halted by intervention

After: Firmly sealed, barring entry and trapping the companions outside while the Doctor is carried inside

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S19E24 · Time Flight Part 2

Nyssa trusts intuition through fissure

The carved rock wall serves as both obstacle and gateway, resisting normal navigation until Nyssa's intuitive guidance activates its hidden mechanism. Its seamless design previously defied detection, but under Nyssa's leadership, it parts dramatically to reveal the concealed passageway, becoming the critical path forward.

Before: Undetected seamless rock wall sealing off the passage, its limestone panels unaltered and unremarkable despite its concealed function

After: Activated entrance swinging inward with mechanical precision, now serving as the revealed gateway to the next chamber

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