Fabula
Object
Object

External Acid Sea of Marinus

Vast, impassable corrosive barrier encircling the base of Arbitan’s pyramid on Marinus, observed from an elevated corridor by the Doctor and companions. Acts as a permanent natural hazard, contrasting with the teleportation device’s safety.
1 appearances

Purpose

Dissolve intruders and threats approaching the pyramid

Significance

Blocks direct access to the pyramid, compels the TARDIS crew to rely on Arbitan's teleportation trap, and heightens survival stakes after the Voord's demise

Appearances in the Narrative

When this object appears and how it's used

1 moments
S1E21 · The Sea of Death
Arbitan’s Blackmail and the Teleportation Trap

The acid sea is referenced as a deadly hazard that the crew must avoid. Arbitan dismisses the idea of using submersibles to cross it, instead offering the teleportation devices as a safer alternative. The acid sea serves as a constant, looming threat, reinforcing the urgency of the crew’s mission and the high stakes of their environment.

Before: A corrosive barrier encircling the pyramid, rendering traditional travel methods impractical. The crew’s only viable option is the teleportation devices, which Arbitan presents as a safer, if still risky, alternative.
After: The acid sea remains an ever-present danger, but the crew’s use of the teleportation devices allows them to bypass it temporarily. The threat of the acid sea lingers, however, as a reminder of the planet’s hostility and the crew’s precarious situation.
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