The icebreaker MSV Fennica, left and the drillship Noble Discoverer in Dutch Harbor. The icebreaker, which suffered a gash to its hull last week while en route to Shell's proposed Arctic drill site, may have been damaged by a previously uncharted shoal. The vessel is a crucial element of Shell's Arctic fleet as it is loaded with a capping stack designed to fit on top of a damaged well in case of a blowout or other emergency. If it's not ready it would put a crimp in Shell's plans to start drilling in the Chukchi Sea, northwest of Alaska.