After a roughly three-year wait for a critical state permit, Enbridge’s Great Lakes Tunnel and Pipe Replacement project for its Line 5 pipeline across the Straits of Mackinac in Michigan has taken a step forward. The Army Corps of Engineers’ permits for the tunnel project would seem to be the only major obstacle standing in the way of construction, but there may well be more challenges ahead. Like a few other oil and gas projects — namely, Mountain Valley Pipeline (MVP) and Dakota Access Pipeline (DAPL) — Line 5 has become entangled in controversy, including local opposition worried that a spill would irreparably damage their surroundings and spoil the state’s natural resources. In today’s RBN blog, we take a closer look at the Line 5 project, its next steps, and the opposition it continues to encounter.