The Brilliant Vigilance of Seattle’s Huge New SR-99 Tunnel

The Brilliant Vigilance of Seattle’s Huge New SR-99 Tunnel

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Say there’s a fire. A fire caused by a car crash, inside a 2.5-mile tunnel under a major American city. It’s a terrifying idea, but if you want that kind of problem to ignite anywhere, it’s in the stretch of State Route 99 that, later this year, will start whisking traffic underneath downtown Seattle. That’s…