Shell Oil is assembling a 29 ship Arctic drilling fleet in Alaska’s Aleutian Islands, but has suffered an initial mishap weeks before it is scheduled to head north and drill for oil in the Chukchi Sea. The icebreaker Fennica, en route from Dutch Harbor to the drilling area, has returned to Unalaska Bay in the Aleutians with a 39-inch-long hole in its hull and a leak in its ballast tank.