Force Field-Protected Emergency Air Supply

Crew switches to this backup air supply system, its force field blocking Cybermen poison capsules and dooming Vallance's sabotage. Shielded tanks deliver steady oxygen through the Wheel amid invasion chaos. Cyberman grip tightens in the adjacent Oxygen Supply Room as failure sparks identity scans. Humming barrier holds firm, a vital safeguard characters credit for survival while planners rage at the thwart.