Lab4dive – “Mobile smart lab for augmented archaeological dives” is a research project aimed to the design and development of a technology system that supports the work of underwater archaeologists, to provide them a practical, cost-effective, and innovative solution for studying, documenting, and preserving the underwater Archaeological Heritage in situ. The project involves several professionals and companies: economists, engineers, researchers, underwater archaeologists, local tourism companies. From a technical point of view, it is focused on the use of an underwater tablet, equipped with: environmental sensors for collecting data during dives; a high resolution video camera for direct documentation; an  acoustic positioning system that operates like an underwater GPS; a 3D map of the site, made by means of acoustic bathymetry, to mark the locations of paths and points of interest.