How can this entire thing be written - including the observation that most entrances are “in or near” Christian churches - without even mentioning the extraordi

How can this entire thing be written - including the observation that most entrances are “in or near” Christian churches - without even mentioning the extraordinarily obvious conclusion of forced or voluntary anchorites? There is a deep tradition of chthonic ascetic monasticism in Christianity. Many, many Churches from this same period have attached anchorite cells. It is easy to imagine similar cells/tunnels being used, unremarked, by choice or coercion.