The Augusta basin, located in SE Sicily (southern Italy), is a semi-enclosed marine area, labelled as a highly contaminated site. The release of mercury into the harbour seawater and its dispersion to the blue water, make the Augusta basin a potential source of anthropogenic pollution for the Mediterranean Sea. A mass balance was implemented to calculate the HgT budget in the Augusta basin. Results suggest that an average of ∼0.073 kmol of HgT is released, by diffusion, on a yearly basis, from sediments to the seawater, with a consequent output of 0.162 kmol y(-1) to coastal and offshore waters; this makes the Augusta area an important contributor of mercury to the Mediterranean Sea. Owing to the geographical location of the Augusta basin, its outflowing shelf-waters are immediately intercepted by the surface Atlantic Ionian Stream (AIS) and mixed with the main gyres of the eastern Mediterranean Sea, thus representing a risk for the large-scale marine system.

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VISAS (Virtual and Augmented Exploitation of Submerged Archaeological Sites) is a collaborative research project created to improve the responsible and sustainable exploitation of underwater archaeological sites. This strategic goal is reached through the development of three services. The first concerns the 3-D reconstruction of the underwater environment by using a methodology for optical and acoustic bathymetric data fusion. The second is based on a virtual reality system for dive session planning and 3-D exploration of the underwater site. Finally, the third service is intended to enrich the diving experience through a virtual guide running on an underwater tablet equipped with a hybrid tracking system. This paper provides a summary report of the project and an overview of the partial results achieved.

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