Tunnel Boring Machine

[mohdjawed80]

my ongoing project .................world most expensive machine TBM

[patrick1wtf]

Very nice video , made it very clear for me. Tnx

[asas2jh]

I always thought it was rock that came out and not a sludge type of material.

[jasonlajoie]

@asas2jh I think it normally is rock that comes out unless they have to go through soil and then they have to use this system to avoid collapse.