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Object
Object

Rebel Heat Exchange System

A critical heat exchange mechanism controlling high-pressure steam condensation beneath the city. The system regulates lethal atmospheric pressure in the condensation chamber where Leela faces execution. When sabotaged, it triggers catastrophic explosions. Copper piping and gauge clusters line the chamber, its operations daunting even for skilled rebels like the Doctor.
2 appearances

Appearances in the Narrative

When this object appears and how it's used

2 moments
S15E15 · The Sun Makers Part 3
Computer announces Leela's execution method

The Rebel Heat Exchange System’s temperature and pressure levels dominate the technical discussion as Synge warns of lethal atmospheric conditions and Mandrell identifies down-to-seventy-centigrade regulation. Its regulatory failure becomes the literal fuse for explosion if manipulated, binding the plan’s success to precise timing.

Before: Operating at regulated pressure levels, indirectly executing Leela via steam production.
After: Positioned as a ticking bomb whose imminent sabotage will catalyze the rescue or destroy half the city.
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S15E15 · The Sun Makers Part 3
Doctor's plan meets crushing impossibility

The Rebel Heat Exchange System becomes the fulcrum of ruin: halting its water supply would trigger a catastrophic eruption. The Doctor gambles on stealing just moments of downtime to pry Leela free, making the system both the enemy and the necessary pivot point for salvation.

Before: Fully operational, pumping lethal pressure into the condensation chamber; critical to the Company’s power grid
After: functionally paused during the rebels’ risky extraction, falling into unknown thermal chaos
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