Take a look at this Mack truck designed to help crews build tunnels quickly with no permanent support work.
[su_youtube url=”https://www.youtube.com/watch?v=LoRIztYmWjY” width=”700″ height=”500″]https://www.youtube.com/watch?v=MfbsY-3sung[/su_youtube]
Video Credit:
Lock Block Ltd.
