HS2 launches the Midlands' first tunnel-boring machine

The video introduces Dorothy, a tunneling machine used for constructing a tunnel south of an ancient woodland. The project emphasizes environmental restoration, aiming to plant 7 million trees and restore the land to its natural state. The tunneling process involves a cutter head and concrete rings. The speaker shares their passion and challenges faced in the project, highlighting the machine's capability to perform nearly nine kilometers of tunneling.

How many trees are planned to be planted as part of the environmental project?

Explain the process of how the tunneling machine creates a gap for building a concrete ring.