[Sara starts a tiny bit--both because the mechanical fellow is very large (compared to her), and it isn't common to have magitek speak in Eorzea. Unless, of course, it was a mammet, which this gentle robot clearly is not. Once she gets over her surprise, though...]

From my best guess, those caverns were contained in that egg that I had. I've seen this happen once before. Domina appeared that way, though what it had been contained in, I couldn't tell you.