There was still some very cool engineering that went into making what it was supposed to be. Check out this video on the 'south lung' youtube.com/watch?v=Wind4fjbt_k

Because they didnt want air going in or out of the biosphere they had to figure out a way to account for the massive change in volume as the air temperature inside changes between super hot days and cold nights, otherwise you'd blow the windows out of the thing during the day.