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A soundscape for Episode 8. Theia\u2019s half-remembered memory of her daughter humming by the sea's edge, used by Guggy for the brain transfer. Wind howls, thunder cracks, gulls call overhead. Headphones are best. With sound design by Graham Wild and Becky Ripley.

Don\u2019t forget to take part in our Forest 404 Experiment to see how you respond to natural sounds at: bbc.co.uk/forest

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