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During a routine tour of Stangmoor’s restricted prison areas, the Governor’s entourage—including Kettering, Summers, and Powers—descends into a lower corridor where the sound of a hanging execution disrupts their conversation. …

In the Process Theatre, Professor Kettering—creator of the Keller machine—experiences a hallucinatory drowning while the machine operates, his phobia manifesting as a fatal reality. As he collapses and dies, the …

The Doctor, witnessing Kettering’s inexplicable drowning death in a dry room, escalates his warnings about the Keller machine’s lethal capabilities. While Summers confirms the drowning symptoms and Jo notes the …