Two hundred miles southeast of Newfoundland, not far from where the Titanic sank, ExxonMobil is spending $14 billion to drill one of the biggest oil fields in the North Atlantic. Seeing Exxon develop oil fields for Canada is reviving calls for the United States to do the same off its Atlantic Coast — which has been closed for oil and gas exploration for decades. But as Shell’s (RDSA) drill ships continue to run aground in the Arctic, critics say letting Exxon drill off the coast of Newfoundland or the heavily populated U.S. Eastern Seaboard is a mistake. The risks: In 1982, the Ocean Ranger — then the largest drill rig of its type in the world — capsized and sank in nearby waters during a winter storm, killing all 84 crew members aboard. Safety standards have improved since then, but drilling in icy, remote conditions remains one of the most dangerous jobs in the businesses — as Royal Dutch Shell’s ill-fated Arctic foray showed last summer.