Webuild: New Genoa Breakwater, 21st caisson installed

PRESS NOTE

• Installation of large and small caissons continues as development of offshore superstructure progresses

• Concrete produced directly offshore: a floating factory supporting the works

GENOA, May 22, 2026 - A new milestone has been reached in the construction of the New Genoa Breakwater: the 21st caisson has been installed offshore the Ligurian port city. The project is being carried out by the PerGenova Breakwater Consortium, led by Webuild, on behalf of the Western Ligurian Sea Port Authority.

This caisson belongs to the large-size category: 67 metres long, 30 metres wide, and nearly 34 metres high, taller than a 10-storey building. It is one of the prefabricated elements forming the structural backbone of the new barrier, whose installation requires highly complex technical operations in open water.

Working at sea means operating under constantly changing conditions, without stable surfaces and with the continuous motion of waves. Despite all of this, all phases-even the most delicate-are managed with continuous quality monitoring of the material during pumping, while ensuring high standards of safety and precision.

The mega caissons are built at a dedicated yard in Vado Ligure, where Tronds Barge 33 is deployed-a semi-submersible barge 110 metres long and 45 metres wide. This is a highly specialised platform capable of submerging up to 20 metres below sea level, allowing operations to be carried out under more stable conditions and facilitating the construction and launching of the caissons, even in the complex marine environment.

Alongside the installation of the caissons for the base, work on the offshore superstructure is also progressing with coordination among the different components of the project. A particularly innovative aspect concerns the production of concrete for the sealing of the caissons, which takes place directly at sea thanks to a dual batching plant installed on a floating barge operating about 800 metres from the coast. In fact, it is a real offshore factory: during the day it produces concrete on site, while in the evening it returns to port to load more raw materials.

The New Genoa Breakwater is a strategic project aimed at strengthening the competitive position of the Port of Genoa and adapting the port system to new dynamics in international maritime traffic. Together with the Terzo Valico dei Giovi-Genoa Node projectp, also carried out by Webuild, it is set to ensure a central role for the Ligurian port in Northern Italy's and Europe's trade flows.

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Webuild is a global leader in the construction of large, complex infrastructure, with a focus on sustainable mobility, hydropower, water treatment and supply, and green buildings. It has long been recognised as the world's top contractor in the water infrastructure sector. Active in approximately 50 countries, the Group employs some 95,000 people directly and indirectly of over 125 nationalities. With 120 years of history and over 3,700 completed projects, Webuild boasts a track record that includes 13,686 kilometres of railways, 895 kilometres of metros, 82,708 kilometres of roads and highways, 1,023 kilometres of bridges and viaducts, 3,466 kilometres of tunnels, and 320 dams and hydropower plants. Among its most iconic delivered projects are the Grand Ethiopian Renaissance Dam, the expansion of the Panama Canal, the Long Beach International Gateway in the United States, the Second Bosphorus Bridge in Turkey, the Riachuelo environmental restoration system in Argentina, and new metro lines in cities such as Copenhagen, Paris, Rome, Milan, Naples, Doha, Thessaloniki, and Riyadh. Among those under construction are strategic public works in Italy, such as the New Genoa Breakwater, the Brenner Base Tunnel, the Pedemontana Lombarda Highway, Rome Metro's Line C, sections of high-speed

and/or high-capacity railways between Genoa and Milan, Verona and Padua, Naples and Bari, and Palermo, Catania and Messina. Abroad, there is the Snowy 2.0 hydropower scheme in Australia and key sections of the Grand Paris Express in France. As of December 31, 2025, the Group reported total revenues of €13.6 billion and a total order backlog of €58.4 billion, with over 95% of the construction backlog aligned with the United Nations Sustainable Development Goals. Webuild is headquartered in Italy and subject to the direction and coordination of Salini Costruttori S.p.A. Listed on the Milan Stock Exchange (WBD; WBD.MI; WBD:IM), its stock is included in the MIB ESG index of Italy's leading blue-chip companies for ESG practices.

More information at https://www.webuildgroup.com