 In addition, the old Enbridge Line 5 will be removed & a new line will be constructed.Within the agreement the MSCA approved the transfer of a property right, which allows Enbridge to construct the new tunnel in bedrock beneath the Straits of Mackinac.The 2013 expansion, coupled with the anticipated expansion of the Alberta Clipper pipeline, led to concerns from the National Wildlife Federation and other groups over the possible shipment of diluted bitumen from the Alberta tar sands through Line 5.