Two Michigan-born adventurers set out to cross the state's Upper Peninsula without burning fossil fuel, tracing a 500-mile route that follows Enbridge's Line 5 pipeline. Built in 1953, Line 5 carries oil and natural gas liquids beneath the Straits of Mackinac, and the film treats its age and location as the central risk: a rupture there would spill directly into the Great Lakes. As the pair move by bike and boat through forest, shoreline, and small towns, they stop to talk with residents, tribal members, and activists who have spent years pushing to shut the pipeline down, along with people who depend on it for jobs and fuel. The travel footage carries the physical difficulty of the route, cold water, long distances, unpredictable weather, while the interviews lay out the competing arguments over the pipeline's future. The film stays close to the ground the whole way, letting the terrain and the people living on it make the case for why Line 5 has become a flashpoint.