At the same time as the archaeological site and its surroundings were being mapped, a side-scan sonar was used to sweep the site in 2002. This technique uses a sonar device that transmits a signal and analyzes the echo that bounces off the seafloor. It provides a view that is similar to aerial photography, but one unimpeded by low visibility and the presence of seaweed.
The Ceres firm, formerly Cap-Info, which is specialised in positioning shipwrecks, carried out the 2002 side-scan sonar imaging of the wreck site.
In 2009, a new scan was carried out by Adramar, and a third one is planned to monitor that the vestiges remain covered. These successive images of the sea floor and the coverage of the wrecks are an excellent tool for ensuring ongoing protection for the site.