'Alone. One journey, then another. Now I am here. Who am I here?' Marvin reveals disturbing information about Riv. But Nat ignores his advice and returns to Silo 605 and is persuaded to try a playlist. As Hanna takes over Jodie's room, Nat's experience both asleep and awake, gets even stranger.

CAST: NAT - Anastasia Hille RIV - Paul Bazely ROZMAY - Rakie Ayola CAROL - Rebekah Staton HANNA - Bryony Hannah HONOUR - Raad Rawi DIZZY - Waleed Akhtar JODIE - Anna Fenton-Garvey MARVIN - Lee Rufford INFOVERT VOICE - Teresa Gallagher IVAN - Ben Crowe

Writer: Anita Sullivan Director: Karen Rose Producer: Sarah Tombling Sound: David Thomas Composer Simon Slater Exec Producer: Rosalynd Ward

Legal Advisor on Stasis Rights: Elizabeth Barrett Cultural Advisor: Francis Gallop Interviewees: Ben Fletcher, Leon Kruger, Mareike Guensche, Camy Creffield, Liz Aggiss, Kiwi Sam

A Sweet Talk production for BBC Radio 4