Just a theory without any facts to back it up, only speculation and I'm
going on memories from months ago...so correct me if I'm off, which I
probably am.

Would it be possible that, like the other gardens, Trabia garden could fly?
If so, maybe Trabia garden's crew figured out how to make it fly at the
same time as the other two gardens, but the garden was hit by the
missiles and crashed further North...if so the crater may just be the place
where Trabia garden was once located, like the craters where Balamb and
Galbadia gardens had been...hmm.

.opt