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Fig. 20. The catamaran Juno at work in South Italy (Photo: D. Bartoli).
Due to her size and limited draft, Juno was able to survey close to shore, mapping large
archaeological objects such as semi-worked marble blocks and column shafts with
remarkable detail. This technology proved to be less accurate and reliable when it came
to locating smaller artifacts, such as amphoras, in deeper waters, but for the large marble
blocks at a depth of 7-8 m, it provided excellent results. Once the multibeam data were
processed and the instruments’ swaths were merged, a three-dimensional map of the
seafloor was generated, illustrating the wreck sites of the three marble carriers of Punta
Scifo A, Punta Scifo B, and Punta Cicala.
The second research vessel, Hercules (Fig. 21), being much longer (37.3 m),
beamier (6.7 m), and with a draft of 1.5 m, was used to survey depths of 25 to 75 m, with
her two keel-mounted Kongsberg multibeam sonar units (EM 1002 and EM 3000D) and
a Benthos side-scan sonar. Theoretically, the multibeam sonar should have been able to
survey to a depth of 1,000 m and the side-scan sonar to 2,000 m.
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