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00000181-fa79-da89-a38d-fb7f2a000000Bertha, the world's biggest tunneling machine, is a five-story-tall monstrosity of drilling tasked with digging out the tunnel for State Route 99 to replace the Alaskan Way Viaduct. It's journey to the center of the earth underneath downtown Seattle began in July 2013, and since then the project has seen its fair share of successes and failures.Follow the progress of the $3 billion megaproject with KUOW.

When life gives you transit debt, make lemonade

A view of the sky over Bertha the tunnel borer, whose efforts brought the SR-99 tunnel to life.
Flickr Photo/WSDOT (CC BY 2.0)/flic.kr/p/yNcg1q
A view of the sky over Bertha the tunnel borer, whose efforts brought the SR-99 tunnel to life.

Let's say you owe me $20.

You decide that to pay me back, you'll set up a lemonade stand. There's about $50 in overhead: lemons, sugar. And don't forget wages for the younger siblings you'll be pressing into service to man the booth.

In the meantime, I decide to charge you $13 in interest. And suddenly, you find yourself needing to raise $100 to pay me that original $20.

That's the position in which users of the new State Route 99 waterfront tunnel will find themselves. KUOW's Paige Browning has been following the story, and joined Bill Radke to break down the numbers.

Year started with KUOW: 1985 – 1986, 1991 – 2004, 2012