Board Thread:Spoilers!/@comment-413929-20141126205136/@comment-24936039-20150307043738

Most of the scenes in OUAT (and I did not realize how much of it was mostly blue rooms with a minimal amount of props until seeing the pre-season episode recap), so using modern CGI, I don't think it would be anymore expensive then hiring a team of good artists to paint most of the background. I mean, seeing Dallas wrestle with a 'giant pickle' that was turned into the flashback of Charming's fight with Mal in dragon form was impressive. Or how much of Gold's shop, Castle interiors, the Library lock Tower is mostly CGI.

So maybe they can do a decent CGI job for most of the underwater scenes. But yeah, I suspect a lot of Poseidon's palace will take place with rooms that have air 'bubbles' or dry. Hey, air breathers need to be accommodated, right?