In the 2nd century BC, Baiae in the Gulf of Naples was a notorious bathing resort and spa for wealthy Romans. Today, part of the town is submerged under the sea and can be visited as an 80,000 square metre archaeological underwater park. The magnificent mosaics from the underwater ruins are analysed at the Istituto Superiore per la Conservazione e il Restauro (ISCR) of the Ministry for Cultural Heritage and Activities in Rome.