Bertha was custom built to dig the State Route 99 tunnel under Seattle. It dug under the city (off and on) from December 2013 to April 2017.
Front view of Bertha, once the world's largest tunnel boring machine
Bertha was custom built to dig the State Route 99 tunnel under Seattle. It dug under the city (off and on) from December 2013 to April 2017.
3 Comments
aessedai@lemmy.world · 4 pts · 3y
Here's the world's biggest TBM.
Tuen Mun-Chek Lap Kok
hemko@lemmy.world · 2 pts · 3y
Boring.
darcy@sh.itjust.works · 1 pts · 3y
Boring.