Greenpeace activists demonstrate on March 16, 2012 in the port of Helsinki as other activists occupy a Shell-contracted icebreaker preparing to sail for the Arctic. Fennica and Nordica, two Finnish icebreakers whose main task is to secure shipping in the Baltic Sea, have been leased out to Shell for the summer seasons of 2012, 2013 and 2014 to help Shell drill in the Beaufort and Chukchi seas off Alaska.