What’s Inside a Manhole?

See-through sewer system... Say that five times fast. Doing it this way - by making the plumbing junctions into access points - just provides a lot of flexibility while also standardizing the system so anyone involved - whether it's a contractor building one or a crew doing maintenance - knows what...

13 min - How Things Work - Practical Engineering

More: How It Works documentaries

Read Deeper: How It Works

1. The Way Things Work Now by David Macaulay (4.3/5) - View on Amazon
2. How Things Work by Louis A. Bloomfield - View on Amazon
3. Thing Explainer by Randall Munroe (4.2/5) - View on Amazon
4. What If? by Randall Munroe (4.3/5) - View on Amazon

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