Icebreaker Ships to Map Arctic Seafloor - Yahoo! News The U.S. icebreaker ship Healy is about to set sail on its way to the Arctic, where it will burst through the sea ice in order to map the seafloor below. The map will help set the record straight on how much of the seafloor a country can claim as its own. 08-04-2010 by lauren Tags livescience.com, science