Sierra receives a tip from a mysterious benefactor. Matilda and Kostantina develop their theory of the Explorers. Z conducts an experiment. Helen and Sierra talk across time. 

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Music is "The Cavern" by Sara Afonso, available at the Free Music Archive. 

Our cover image is courtesy of the Wellcome Library and has been made available under Creative Commons License 4.0. 

All sound effects can be found at https://www.freesfx.co.uk/