![Domenico Stinellis International journalists scan the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/d70b8cfc86eb47b8b60b905505eddc79/preview/preview.jpg?s=680x)
International journalists scan the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis Workers inject reactive chemicals to consolidate the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/dcfaae57e7c04f7cb1b13b6a09eae280/preview/preview.jpg?s=680x)
Workers inject reactive chemicals to consolidate the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/a4dc947242b3452abfac4234bf5554ec/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis Chief engineer Andrea Sciotti, center, technical director for Rome's new 25.5-kilometer Metro C subway talks to international journalists at the construction site of line C main hub in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/aff6cc37be4949a9a8d482dd928853af/preview/preview.jpg?s=680x)
Chief engineer Andrea Sciotti, center, technical director for Rome's new 25.5-kilometer Metro C subway talks to international journalists at the construction site of line C main hub in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/6fce9aef8ddf45c5af2bfe20d68ccf75/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024.During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/29c4e455960d4c1b850110558aba6e3d/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024.During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis Workers inject reactive chemicals to consolidate the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/a5cf827927e742f48bdd3c2f1745f83b/preview/preview.jpg?s=680x)
Workers inject reactive chemicals to consolidate the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/0eea7097fab14ec483c2297bbef69b00/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/fd270a212c6a4e948ab2754fde008783/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034.(AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/83fbfe54b5f843b9a027c860537c0e40/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034.(AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/462728bae3f24887bfcbace8b978b7ab/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/3a0ac3dc93784d82ad1641cf0ace2bac/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A giant hydro-milling machine rests inside the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/d1117e2585b04e8e9374c2f5e91e6544/preview/preview.jpg?s=680x)
A giant hydro-milling machine rests inside the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/c2dbd72109d949dfbb4050ceff1f07f9/preview/preview.jpg?s=680x)
A view of the construction site of the new 25.5-kilometer Metro C subway main hub in Piazza Venezia in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, chief engineer Andrea Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. (AP Photo/Domenico Stinellis)
![Domenico Stinellis Chief engineer Andrea Sciotti, center, technical director for Rome's new 25.5-kilometer Metro C subway talks to international journalists at the construction site of line C main hub in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)](https://mapi.associatedpress.com/v2/items/f71daaa97d834d309f2fb24b79c8fb22/preview/preview.jpg?s=680x)
Chief engineer Andrea Sciotti, center, technical director for Rome's new 25.5-kilometer Metro C subway talks to international journalists at the construction site of line C main hub in central Rome, Thursday, May 23, 2024. During a tour Thursday of the construction site at Piazza Venezia, Sciotti said works on the nearly 3 billion euro project, considered one of the most complicated in the world, were running at pace to be completed by 2034. In the background the Unknown Soldier monument. (AP Photo/Domenico Stinellis)