UPDATE (February 22nd 2024) - The strats below are fairly outdated since you can just use the compass right after clipping through the wall and get right to the end very easily, see here for what that looks like:

A guide showcasing an upgraded version of the Inner Atlantis OOB that I have been using in runs for a bit. Shoutouts to Saiyanz for coming up with the idea of using the compass to make the setup a lot easier :)

Safer OOB Guide (scroll further for risky/backup):

Highlight from one of my streams, showcasing what to do if you either start falling right after clipping through the wall, or just wanna go for a faster (but somewhat riskier) setup: