Accidently discovered an OOB in Sunken Harbor during my casual playthrough. Attached is a photo of the location. Sorry I wasn't recording video.

I got past the enemy located here with a slide. Lured him to the end of the hall and performed an Execution Parry against the wall. After the animation ended I was OOB. Had character control and camera control revealing a partially loaded room to the east. I did not explore it but thought I would leave this here in case it helps anyone looking for clips.