HYPOGEAN ARCHAEOLOGY: Research and Documentation of Underground Structures Edited under the Aegis of the Federazione Nazionale Cavità Artificiali (F.N.C.A.): No 6 Atti III Congresso Nazionale di Archeologia del Sottosuolo: Massa 5-7 Ottobre 2007 The study and registration of artificial cavities means the documentation of underground structures. Just as Man started creating buildings on the surface of the Earth, over the course of time, he also perforated the surface thus creating new spaces and handing down structures which are essentially intact, which can be studied, restored and even utilised. In fact there exists an underground heritage, consisting of structures both built and buried underground over the passing of time. The interpretation and understanding of such structures is a source of interesting information on our past, in favour of the present. This series was created under the aegis of the Federazione Nazionale Cavità Artificiali (F.N.C.A.). The aim is to create a base for the disclosure of relevant, scientific research studies, whether monographs, the works of various authors or documentation from conferences and conventions and a series of easily consultable tools for the development of artificial cavity research. Translations by Federica Barna and Sara Bianchi