No. 5: Harriet
Updated On: Dec 15 2011 12:04:34 PM EST
Meet Harriet, the giant earth-boring machine that's drilling a new Port of Miami tunnel.
Harriet started drilling a few months ago and will keep going for more than a year.
The $1 billion port tunnel project should be complete in 2014.
Nov. 15: Miami port tunnel drilling begins
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