The Doctor's ethical dilemma between scientific curiosity/radiation risk and protecting allies during critical discoveries

The survivors press through the gas-free mine passage, their urgency compounded by the distant sound of collapsing tunnels left sealed by the Marshal. As they reach a massive lead-reinforced door …

In the Radiation Cavern's pulsing glow the Doctor moves deliberately amid erratic light patterns that mutate like living things. The cavern’s beauty is undeniable—a cathedral of untold scale carved by …