After the break, Carter's feeling pretty lousy. Even if they do somehow get out of the bunker, there's no longer enough Element X to cure Zoe or anyone else in town. "We need to save your daughter," Eva says, suddenly confident. Ah, but that's because she's got a little vial of Element X in a desk drawer ready to give away. She says her brother sent her off with it in case she ever needed it (for ... what? To expose herself to so she could age extra-super-slow?), but Zoe needs it more. She hands it to Carter. It would have been kind of funny if he'd dropped it, but I guess when it comes to something that will save his daughter, he's much more careful than he is with, say, mysterious metal canisters. "What about you?" Carter asks Eva. She says she'd rather save someone else than hold onto it for the rest of her life.
Jo, Zane, and Hendrix make their way to the bunker site armed with anti-instantanium stuff. Jo has also come armed with a bad mood. She says she thinks Carter is in the ventilation shaft, which is the weakest point of the bunker. Zane says she might know that, but how will Carter? Jo says they both looked at the blueprints, and since they work well together and trust each other, unlike some other recently failed pairings, he'll know what she knows. And just in case you're wondering why we've never heard of this ventilation shaft before, Jo and Zane quickly exposit that it was here the whole time but the maps called it a capped well. Even Eva, who was THERE AT THE TIME, had no idea this place existed, or else she surely would have used that as her access point to the bunker instead of bothering with cryptex locks and the like. Whatever. The top of the shaft is easily removed by attaching it to the back of Jo's car and dragging it off.
Eva asks Carter why they're hanging around in the air shaft room. He says it's their "best bet" to be saved. But Eva's gone all negative again, saying no one on the surface even knows they're down there, let alone how to get them out. Carter says he and Jo looked at the same blueprints and would therefore come to the same conclusion. The air shaft is the bunker's weakest spot. She'll look for him here. Eva says the foam is invulnerable. Carter thanks her for reminding him of the direness of their situation. And then, there's a noise. Yes, Jo and Zane have CGI-exploded the instantanium away, freeing Carter and Eva. Jo lives it up in her moment of glory: "my name is Jo Lupo and I'll be saving your ass today!" she says. "Somehow, I'll promote you," Carter says, looking like he could kiss her. Jo doesn't seem to be holding out much hope of that, but that's only because she doesn't know what foreshadowing is.