As part of the MAELSTROM project, a video survey was conducted on 23 September 2022 at the abandoned mussel farm (MF) site in the coastal area outside the Venetian lagoon. The purpose of the survey was to visually document and classify marine debris items on the seabed and to support the validation of previous bathymetric analyses. The inspection revealed several types of debris, including mooring structures, ropes, and derelict fishing gear, elements that are often challenging to detect through remote sensing techniques alone.

As part of the European MAELSTROM project, a combined approach using bathymetric analysis and underwater video inspections was applied to investigate marine litter (ML) accumulation on the seafloor in the urban area of Sacca Fisola (SF). The integration of multibeam echosounder (MBES) data with diver-operated video transects allowed not only the visual validation of acoustic results but also a more detailed mapping of litter items. During a 100-metre transect conducted by professional divers on 12 July 2022, 34 marine litter objects were identified and classified. This multiparametric strategy enabled the spatial georeferencing of debris and an estimate of their percentage coverage on the seafloor.