He just dig himself completely under... Should I let him test it and see how it goes? Or should I dig him up tomorrow and take him?
I'd take him in. Also remove his large water dish and replace it with one that he can't drown in for the time being. Don't want him to get in and not be able to get out. With the way he is leaning he could easily drown. If it is dislocated he can't reset it on his own.