Green Glow

A sickly neon-green luminescence seeps from the tunnel walls ahead of the Doctor and Tegan, its pulsating light outlining jagged rock formations and casting eerie highlights on their wet surfaces. The glow intensifies as it nears, its unnatural hue contrasting sharply with the dim, damp tunnels, and its presence triggers immediate wariness in both companions. Both recognize the light as a direct warning of the Tractators' proximity, their reactions moving from curiosity to urgency as the glow's ominous radiance bathes their path.