...Here's an old video, well to me. I took it in June of 2011 while at the World Trade Center. The video shows a Cat 345CL excavating 'Manhattan Shist', which is basically the bedrock and dirt below normal grade. They were excavating for the Vehicle Security Center, where each vehicle is checked in order to go into the WTC property. The video shows him throwing some 'shist' and moving a blast mat.
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