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Ground freezing TBM drive collapse in Germany
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LittleInch
Petroleum
Maybe don't do a freeze operation in the summer? ?
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Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
btrueblood
Mechanical
They should call the people who ran the "Big Bertha" tunneling machine in Seattle - it had to be dug out of its hole after a cutter head failure.
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