- Name
- Tunnel Boring Machine
- Aliases
- Tunneling Machine
Tunnel Boring Machine
A cylindrical machine used to carve tunnels through rock and soil. Some are extremely large and are operated by a team of workers from the inside.
Overview
Real World
The largest TBM ever made, nicknamed "Bertha", was custom-built by Hitachi Zosen for the construction of a 1.7-mile tunnel underneath Seattle (Location), Washington. It measures 57.5 ft across and 326 ft in length, weighing over 7000 tons.