We built an underground dragon-themed swimming pool with a tunnel water slide, creating a unique and breathtaking design. Using simple tools and creative techniques, we carefully excavated, shaped, ...

An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to ...

Six contractors are competing to build Norway’s Stad ship tunnel, a 1.7km long underground canal that will let ships avoid ...

The Hawthorne Tunnel is a 1.14-mile tubular, underground tunnel that generally stretches around the perimeter of the Hawthorne Municipal Airport. The tunnel was built to test the operation of ...

A joint venture of Tutor Perini and its heavy civil engineering subsidiary, Frontier-Kemper Constructors, has won a $1.18bn ...