Units of Shell's oil drilling fleet leave Dutch Harbor for the Arctic Ocean. The Aiviq anchor-handler has begun the long sea journey, bearing some of the massive anchors that will be set to hold the drilling rig Noble Discoverer in place as it drills a well in the Chukchi Sea, Shell informs the 'Alaska Dispatch'. The ice-breaker Fennica , which will deploy a sound-recorder to establish an acoustic footprint of the anchors being set, also left Dutch Harbor. It will provide baseline…