Prof. Mireille Hildebrandt wrote a 'Preface on Navigable and Unregulable Space(s)’ for the Italian/English volume on HUMAN SECURITY IN NAVIGABLE SPACES: COMMON CHALLENGES AND NEW TRENDS, edited by Giorgia Bevilacqua, published in the context of the Project on ‘HUMARCYSPASE. Protecting Human Security with non-state-actors in the MARitime and CYber SPAce'.