Doctor guides Jo through maggot tunnel

Used as a punt-like vessel, the rusted coal wagon is propelled manually along the narrow cavern rails, its warped planks bearing the weight of two human travelers and their sparse gear. The Doctor wedges a pole beneath the undercarriage to shove them forward through the submerged rails while Jo steadies their course, the wagon’s creaks and groans a constant counterpoint to their struggle.

The improvised pole serves as the sole propulsion mechanism, wedged beneath the wagon’s undercarriage and braced by the Doctor’s foot. Jo grips the opposite end, absorbing jolting vibrations as they punt through the maggot-choked tunnel. Its splintered surface becomes a tactile link to their shared effort and fragile solidarity.

A slimy, pulsating carpet of maggots fills the gap between the rails, their collective motion producing slick trails on the steel. Their damp mass clogs the tunnel, forcing the pair to navigate through without stepping onto the squirming tide. The creatures contribute to the stench and visual horror while underscoring the escalating contamination from the green substance.

The Marshland Cavern serves as their egress pathway beyond the contaminated tunnel system, a dark expanse concealed by hanging vines and wet stone, its smooth path worn by time and recent tremors. After escaping the maggot-choked tunnel, the cavern offers comparative relief—though its ancient silence and scattered remnants of past miners hint at dangers yet unmet.

The claustrophobic West Seam Roadway narrows into a tunnel slick with green fluorescence and maggot trails, its wooden beams groaning under unseen pressure. Emergency doors hang ajar, their seals broken, while the air thickens with the stench of alien decay. The space shifts underfoot as weaker struts collapse inward, turning the roadway simultaneously into a prison and an escape route for the two travelers.