Circle Line

Arnold warns Chorley that fungus blocks the Circle Line tunnel, rendering it impassable for escape from Goodge Street. Soldiers track the black-marked advance on the illuminated Underground map, from Euston Square toward King’s Cross, where Yeti overrun sections defy grenades and weapons. Distant train rumbles echo the subterranean threat, as Chorley’s suggestions of Northern or Central Line alternatives fail. The line traps units below London, amplifying ops room dread over unchecked spread.