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[narrator] The last stages
of the dig will be
done by hand, so cast iron supports need
to be dropped in
to protect the workers
of the dig will be
done by hand, so cast iron supports need
to be dropped in
to protect the workers
Full Transcript
00:00:01.000 --> 00:00:04.017
[narrator] The last stages
of the dig will be
done by hand,
00:00:04.207 --> 00:00:08.377
so cast iron supports need
to be dropped in
to protect the workers.
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Movie Summary
An up-close look at the heroes that keep America's sewer systems running.