The Roman Maritime Concrete Study (ROMACONS): the harbour of Chersonisos in Crete and its Italian connection

Vitruvius stated that it was necessary to use pozzolana from the Naples region in Italy to make hydraulic concrete that could set underwater. How extensive was the use of this particular material? We know that pozzolana was shipped across the Mediterranean from Italy to Israel for the construction of the major harbour of Caesarea. But did the Romans also export it to minor cities such as Chersonisos in Crete to build the concrete moles for its harbour? The Roman Maritime Concrete Study (ROMACONS) was established to answer these questions and others related to the use by the Romans of this extraordinary technology.