tunnel boring machine
machine used to excavate circular tunnels through a variety of soil and rock strata
Bertha
One of the largest tunneling machines in the world and currently used in Seattle, USA
Martina
tunnel boring machine
Elaine tunnelling machine
Elaine tunnelling machine used to bore the tunnel of line B of the Rennes subway
TRUDE
museum
Beck tunnel boring machine
during its lifetime the largest tunnel boring machine in the world