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Object graph
Object

Thal Dome Toxaemia Monitor

Stationary environmental sensor mounted on chamber walls, crucial for detecting toxic gas levels and signaling lethal conditions to prisoners
2 appearances

Purpose

To measure airborne chemical toxicity levels in real-time, triggering escalating alarms as atmospheric conditions approach lethal thresholds within enclosed spaces.

Significance

The monitor's relentless escalation from background noise to lethal signal mirrors the Thal dome's transformation from forced-labor facility to deathtrap. Its readings make visible the Kaleds' genocidal calculus—each slave's forced labor directly contributes to the chamber's toxaemia death clock.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S10E23 · The Green Death Part 3
Elgin exposes Fell’s unauthorized operation

The control indicators display erratic readings with Tank 2 suddenly full and Tank 1 almost empty, contradicting Fell’s claim of routine cleaning operations. Elgin uses these discrepancies to deduce the unauthorized diversion of chemical waste.

Before: Displaying stable readings consistent with routine operations
After: Showing dynamic fluctuations that reveal covert activity
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S12E12 · Genesis of the Daleks Part 2
Kaled captive reveals suicide weapon to slaves

The rectangular toxaemia monitor on the chamber wall glows with Safe initially; its needle swings rapidly toward Toxic Level as each cylinder passes, alerting everyone to the air’s lethal transformation.

Before: Displaying Safe, but sensor drift visible.
After: Pinned at Toxic Level with shrill alarm pitch rising.
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