
9 ฤดูกาล
77 ตอน
Extreme Engineering - Season 2 Episode 9
In northern Minnesota, the operators of the world's largest open-pit iron mine commission the construction of a $10 million custom-built super-shovel in the hopes of making excavation more efficient.
- ปี: 2011
- ประเทศ: United States of America
- ประเภท: Documentary
- สตูดิโอ: Discovery
- คำสำคัญ: engineering
- ผู้อำนวยการ:
- นักแสดง:


"
"
"
"
"
"
"
"
"


















