No. 5: Harriet

Published On: Dec 14 2011 04:18:27 PM EST   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.

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