Eva's in the bunker with her personal security team and Hendrix, who says she really knows how to "work a man." "So I've been told," Eva says without missing a beat. Isn't she the little firecracker? Hendrix says the bunker will soon be an instantanium fortress, with every possible entrance blocked with five feet of the stuff. He is worried that she's rushed him too much, as she moved up the deadline, leaving him no time to calibrate the explosion properly. He warns her that there might be some geological disturbances and earthquakes as a result. Eva ignores this and asks him if the instantanium will seal the place off for good. "Nothing breaks my instantanium," Hendrix says proudly. With that, Eva dismisses him and heads back into the bunker. Hendrix tells her to be quick in there, since whatever's inside the bunker when the instantanium bombs go off will stay in there forever.
Carter and Jo pore over a blueprint to the bunker looking for weak points. Zane is left standing around. He tries to ask them nicely to move over just a bit but is ignored. Blueprints are serious business.
And now Zoe is in the GD infirmary. Carter's teleported there to meet her, and Henry is playing doctor. He diagnoses her with cataracts in both eyes and says they're easily removed with some GD cataractaway device. Carter breathes a sigh of relief. Lexi wants to know how this happened. "SARAH's lasers. Really bad for the eyes," Henry says way too quickly. He then pulls Carter aside. The laser excuse might fool Zoe and Lexi, but not him. He says cataracts don't come from lasers; they come from old age. "Yes," Henry sighs. SARAH was right all along -- Zoe's DNA has changed, and every cell in her body is aging rapidly. She must have been exposed to whatever those bodies were exposed to when she was in the bunker. Carter frets, but pulls himself together to think and remembers that Zoe slipped in a totally safe-looking puddle of purple goo when she was in the bunker, as we've been seeing on the "previously" segments for the last two episodes, so we all knew this would come into play sooner or later. Henry says he'll need a sample. Carter says he'll go back to the bunker to get it, and Henry sends him off telling him that GD has a team devoted to reversing cell aging and to "try not to worry." But they both know that's impossible.
Carter walks past Fargo and Allison, who call him back saying he "needs" to see something. He takes a look at Fargo's little phone screen thing and says "that's impossible." Allison says "impossible" answers a lot of questions. Except for the most important one, which is, of course, "how is this possible?"