The Youtube channel 13th Vessel has uploaded an interesting YouTube video named “KINGDOM HEARTS III - Exploring Scala Ad Caelum [Out of Bounds]” where they freely explore Scala Ad Caelum. In this video, they take Sora all across Scala Ad Caelum, to areas entirely hidden to the player during Kingdom Hearts III. We get to see typically unseen locations that are between and behind the buildings. This is the first instance in which we can see the full scope of Scala Ad Caelum and how much was created for this area of Kingdom Hearts III. This video is quite beautiful and insightful for any Kingdom Hearts fan.
13th Vessel is skilled in hacking, glitching and modding the Kingdom Hearts games, and has a range of interesting videos on this topic, as well as many other Kingdom Hearts related videos. You can watch the video below.
There is also a glitch tutorial video regarding Scala ad Caelum. You can watch that below.