In this May 14, 2015 file photo, the oil drilling rig Polar Pioneer is towed toward a dock in Elliott Bay in Seattle. (AP Photo/Elaine Thompson, File)
In this May 14, 2015 file photo, the oil drilling rig Polar Pioneer is towed toward a dock in Elliott Bay in Seattle. (AP Photo/Elaine Thompson, File) Elaine Thompson AP
In this May 14, 2015 file photo, the oil drilling rig Polar Pioneer is towed toward a dock in Elliott Bay in Seattle. (AP Photo/Elaine Thompson, File) Elaine Thompson AP