Activists hang from the St. Johns bridge in an effort to block the Royal Dutch Shell PLC icebreaker Fennica from leaving for Alaska in Portland, Ore., Thursday, July 30, 2015. The icebreaker, which is a vital part of Shell's exploration and spill-response plan off Alaska's northwest coast, stopped short of the hanging blockade, turned around and sailed back to a dock at the Port of Portland. (AP Photo/Don Ryan), APTOPIX