The project involved completing the motorway-like stretch of road between Catania and Siracusa between Passo Martino, on the city service artery, and km 130.4 on the SS 114 main national road.

In particular, the operations carried out regarded the geological and geotechnical assessment and geotechnical design along a 25 km section, and drawing up construction documents for 5 natural twin-bore motorway tunnels (about 11 km), 4 artificial tunnels, 20 major structures, a further 40 minor structures (manholes, watercourse crossings and underpasses with openings of up to 16 m), embankments (up to 10.5m in height) and entrenchments (up to 30 m in depth).

The section includes the following tunnels (from north to south): S. Demetrio (L=2800 m), Filippella (L=1000 m), Agnone I (L=200 m), Agnone II (L=150 m) and Serena (L=1050 m). The excavation work involved rocks both of sedimentary (Monte Carruba calcarenites, Pleistocene calcarenites and the respective base conglomerate) and volcanic (Pliocene volcanic rocks) origin. Lastly the heterogeneity of the rocks comprising the Carlentini formation (Upper Miocene) should be mentioned. For long sections of boring, this entailed passing through fronts of 'mixed lithotypes', characterized by contact between rocks with different geomechanical characteristics.