The future of Enbridge’s Line 5 has suffered a huge setback, Sarnia Mayor Mike Bradley says. The future of Enbridge’s Line 5, an oil and natural gas liquids pipeline vital to Sarnia petrochemical industries, has suffered a huge setback, Sarnia Mayor Mike Bradley says. Recently, Michigan’s Supreme Court agreed to hear a challenge by environmental groups and tribal nations of Michigan Public Service Commission’s approval for Enbridge’s tunnel project. Article contentBradley said Sunday this decision is a huge setback for the future of Line 5. Recently, an Alberta to Sarnia pipeline proposal called the northern shield energy corridor was announced.