Royal Dutch Shell is days away from drilling in the Arctic Ocean—betting it can find enough oil to justify the huge risks that keep almost every other competitor out of those icy waters. The company is hauling two massive rigs—the Polar Pioneer and the Noble Discoverer—more than 2,000 miles up and around the Alaska coast to the Chukchi Sea, where it plans to begin work the third week of July. Accompanying the rigs are 30 support vessels and seven aircraft, a large entourage even by big oil-company standards. The voyage represents Shell’s effort to mount a comeback in the Arctic three years after a different rig ran aground following an unsuccessful drilling season. This time, Shell executives say they have both costs and safety under control, but the project has already hit a snag. A federal agency said last week that Shell can’t drill wells […]