Nara Burns lands on Venus on her own, with the intention of finding her family.
When J.T., Alec, and Diane come to the realization that the Neo sapiens have released the barges full of exiles to allow them to plunge into the sun, Diane begins to cry. It may be that she realizes that this was the fate her "exiled" husband and child met, and compounding the tradgedy is the fact that she had been betraying the resistance for their sake.
Marsh, DeLeon, and Marsala know that the traitor is Diane.
Marsh: "That's the only door to this room!"
(explosion, cut to Alec standing near large opening in wall)
DeLeon: "Not anymore."
DeLeon (as they are being herded into the Neo prison barges): "If this is first class I don't want to see economy."
Diane: "Well, aren't you going to do something?"
Marsala (as he moves out of the shadows, revealing his identity): "If you insist."
Diane: "You are Marsala! How..."
Marsala: "Like you I am a stowaway. The uniform was... acquired."