As they dug the tunnel below Boston's elevated Central Artery, an army of contractors encountered the subterranean infrastructure that powered the city gas, thermal, electric, telephone and sewer lines. It slowed down work and drove up costs. But for six years the overall cost of the Big Dig never changed. This episode unravels the Big Dig's accounting and explores why cost overruns came to define the project.

This is the sixth in a ninepart podcast series about history and politics of the Big Dig – one of the most notoriously troubled infrastructure projects in American history. It was created as an audio experience. This presentation includes archival images.

Episode 1:    • The Big Dig began with activists who ...  
Episode 2:    • How two competing tunnel projects bec...  
Episode 3:    • How Boston's Big Dig survived Preside...  
Episode 4:    • Here's why Boston's beloved Zakim Bri...  
Episode 5:    • It took a feat of engineering and a p...  
Episode 7:    • How a power struggle over a Massachus...  
Episode 8:    • Boston's Big Dig tunnels were nearly ...  
Episode 9:    • The Big Dig transformed Boston, so wh...  

You can find more about The Big Dig podcast at https://www.wgbh.org/podcasts/thebig...

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