The "core" of the dungeons

How do you combine the freedom of Survival mode and the role-playing of Adventure mode in dungeons? I really like the sea monument, because you can't just make a hole in it and pull the valuables out without facing the enemy. It's about mining fatigue. I suggest adding a new block (at least technical) that could be inside the dungeons. Until the player breaks this block (source of experience), fatigue will not stop imposing. This will force the player to really explore the structure. It will be possible to break everything one stone at a time only after "passing".