Further down... Alisaie and I managed to go pretty deep.

[Though, she's a little turned around now without any of the people here to guide them, so she just motions forward to where the cavern winds in a downward path through the rocks.]

We thought that maybe if we went deeper, we'd be able to find more, but it just got worse the further we went. Less and less crystals... and what we did find were just broken pieces.