I'm not really feeling Antartica either. But maybe we can create the lost world ride somewhere else because it sounds really cool!
These are certainly both still great options!What about replacing indoor Antarctica with indoor Atlantis?
Nearly every culture has its Lost World myths, from Shangri La to El Dorado to the Lost Mines of Solomon. Any of these could involve S.E.A. and a Dino expedition.
An indoor Atlantis sub-land sounds great too; there’s also the very similar Lemuria, which is basically Oceania’s Atlantis, in case Europe is getting too crowded.