They wake up on the plane, and the flight attendant starts approaching them one by one with a brochure, saying, "We're landing in twenty minutes." :)
And here's something else that's unclear to me. Was the girl an architect on all levels, or was each person on their own, or were they all working together? I remember the ventilation in the mountain base, but that was the heir's dream, obtained through a projection of his mind. Whose ventilation was it? His addition, or, if I remember correctly, Aims's, as he was the formal architect of that layer? And why were they looking for a girl for this role in the first place? For the first level?
God save us everyone
Will we burn inside the fires of a thousand suns...