The tunnel was regarded as one of the greatest specimens of engineering skill and had a length of 5,300 yards, or three miles ...

This photo taken on March 25, 2025 shows the construction site of the Shantou Bay undersea tunnel in Shantou City, south ...

This photo taken on March 26, 2025 shows the Shantou Bay undersea tunnel in Shantou city, South China's Guangdong province.

This photo taken on March 25, 2025 shows the construction site of the Shantou Bay undersea tunnel in Shantou City, south ...

The Fehmarnbelt Tunnel is being built and assembled for positioning under the sea floor between the shores of Germany and ...

Fehmarnbelt will have a price tag of around $7.4 billion, and is expected to be a boon in both cross-border business and tourism.

An aerial drone photo taken on March 17, 2025 shows the Banyou No.1 Tunnel along the Xining-Chengdu railway in Ruoergai ...

An aerial drone photo taken on March 17, 2025 shows the Xining-Chengdu railway under construction in ...

In addition to being the world's first single-bore, double-track high-speed railway undersea tunnel, it has also become the world's largest excavated diameter railway undersea tunnel that has been ...