You’re indoors in the sense that you’re protected from the weather and the elements, and the cave could even have some kind of covering or entrance area that could be considered a door or doorway. People have built homes in caves.
Is caving an outside, inside activity?
‘Civilized’? You’ve clearly not seen my house then, it’s wall-to-wall beer cans, some empty, some not, some with piss in
That’s why civilized was in quotes. You’re “civilized”