When Seattle decided to put in a new highway tunnel beneath the city, a machine was specially built to dig the 2-mile long, 57-foot wide project. The 6,700 ton machine – nicknamed Bertha – got ...

Tunnel boring machines are the true titans of modern construction, with massive machines like Bertha and Heron Connect revolutionizing the way cities are built. These colossal machines can carve ...

when I came across this cool photo of Seattle’s tunnel-boring machine, currently under construction in Japan. When it’s finished, it will be the world’s biggest, and will be used to dig the SR 99 ...