Welcome in the forum, FGuzman14.
The bug you described unfortunately hasn't been fixed yet by the developers of the console version (who are not active in this forum personally).
There is a thread in the german forum you could follow with the help of google translate, if it helps: viewtopic.php?f=83&t=14088&start=180#p137041
But there is nothing you can do right now about that flooded hollow bug. You could swim through there in the classic version of the game and in the pc version - and maybe also before the latest console patch - but not anymore, currently.
Since this dungeon is optional and not mandatory for completing the main quest, maybe you could explore other regions of Thorwal until that bug is fixed.