We're underground now, aren't we? [It's impossible to tell how far they've fallen from the top, and it seems like a long trek upwards.]

I don't think there's anyone living here now, but we might be able to find some answers above ground. [It was likely that they were within the sealed area after all, and Minato doubts anything can survive here for long, what with the creatures in the water appearing to be the only source of food.]