Sentence:  On its arrival at Bank, incidentally, the City & South London's directors had threatened to demolish the church of St Mary Woolnoth, but after a public outcry the company built its station in the <WSD>crypt</WSD> of the church, the bodies being transferred [...]. Therefore St Mary Woolnoth doesn't have a <WSD>crypt</WSD>. Or you could say that its <WSD>crypt</WSD> is Bank station. 
Meaning of the word marked with <WSD> tags:  An underground vault, especially one beneath a church that is used as a burial place. (from 16th c.)