Refinery Gasometer (Steel Echo Chamber)

Robson invokes the gasometer as a mechanical explanation for the thumping sound, arguing that its echo chamber effect amplifies even minor noises into thunderous reverberations. This object becomes a symbolic battleground, with the Doctor and Van Lutyens rejecting its mechanical justification in favor of an organic interpretation. The gasometer’s role in the debate underscores the clash between institutional dogma and emerging supernatural threats, its vast structure looming as a metaphor for the refinery’s blind faith in machinery.

The refinery gas flow is the critical resource at the heart of the conflict. Robson insists on maintaining it at all costs, prioritizing production over safety, while the Doctor and Van Lutyens warn that halting it is the only way to prevent catastrophe. The gas flow's unchecked pressure buildup becomes a metaphor for Robson's stubbornness—an unstoppable force hurtling toward disaster. Its status as a 'critical resource' is both literal and symbolic, representing the refinery's lifeblood and the characters' clashing priorities.