'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 StatonHANNA - Bryony Hannah HONOUR - Raad Rawi DIZZY - Waleed AkhtarJODIE - Anna Fenton-GarveyMARVIN - Lee Rufford INFOVERT VOICE - Teresa Gallagher IVAN - Ben Crowe

Writer: Anita SullivanDirector: Karen RoseProducer: Sarah Tombling Sound: David ThomasComposer Simon SlaterExec Producer: Rosalynd Ward

Legal Advisor on Stasis Rights: Elizabeth BarrettCultural Advisor: Francis GallopInterviewees: Ben Fletcher, Leon Kruger, Mareike Guensche, Camy Creffield, Liz Aggiss, Kiwi Sam

A Sweet Talk production for BBC Radio 4