Last year, 1 million gallons of diluted bitumen flooded the town of Marshall, Mich. An investigation into “the biggest oil spill you’ve never heard of.”

Last year, 1 million gallons of diluted bitumen flooded the town of Marshall, Mich. An investigation into “the biggest oil spill you’ve never heard of.”

Last year, 1 million gallons of diluted bitumen flooded the town of Marshall, Mich. An investigation into “the biggest oil spill you’ve never heard of.”

Last year, 1 million gallons of diluted bitumen flooded the town of Marshall, Mich. An investigation into “the biggest oil spill you’ve never heard of.”