Cersei is awoken by guards & she is confronted by tragedy, she is appalled at the way everyone is reacting & she doesn‘t know how to react herself.
Jaime is searches the hidden tunnel, but needs to find keys to a gate where the tunnels converge. Cersei tells Jaime he must be Hand now, he rebuffs her
As her mind reels she notices Varys is absent.
Tyrion is discovered to be missing from his cell