Pandaemonium's Current Whereabouts (Anabaseious Spoilers)

[Cleretic]

Got the impression that what we found in the sea was the pandaemonium of eld.

Nope, was outright confirmed that Athena ripped out a chunk of Azys Lla (specifically the Aetherochemical Research Facility, a.k.a. where Lahabrea died), transformed it into Pandaemonium, and slammed it down into the Aetherial Sea.

You could make an argument that she picked the Aitiascope because that was near where Pandaemonium was, though--narratively it's there because it's the part of the Aetherial Sea we have easy access to, but Athena doesn't have any stated reason she slapped it down in that part of the Aetherial Sea, so that reason's as good as any.