By Lisa Song and and David Hasemyer

It has been three years since an oil pipeline owned by Enbridge Inc. ruptured near Marshall, Mich. and spilled more than a million gallons of Canadian tar sands oil into the Kalamazoo River. It was the largest inland oil pipeline spill in U.S. history.

InsideClimate News reporters Elizabeth McGowan, Lisa Song and David Hasemyer won this year's Pulitzer Prize for national reporting for their three-part narrative of the spill, "The Dilbit Disaster: Inside the Biggest Oil Spill You've Never Heard Of," and for their follow-up investigations. In their work, the trio described the unfolding of the Michigan oil spill from the point of view of those directly involved, and examined national pipeline safety issues and how unprepared the nation is for the impending flood of imports of a more corrosive and more dangerous form of oil.

In June 2013, InsideClimate News visited Marshall to see the progress of the cleanup efforts, and to talk with residents, scientists and officials.

Click here to read the Pulitzer Prize-winning series and here to buy the three-part narrative as a Kindle single on Amazon.

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