McClatchy Newspapers: A decade ago, U.S. government regulators warned that a major deepwater oil spill could start with a fire on a drilling rig, prove hard to stop and cause extensive damage to fish eggs and wetlands because there were few good ways to capture oil underwater. The disaster scenario — contained in a May 2000 offshore drilling plan for the Shell oil company that McClatchy has obtained — is now a grim reality in the Gulf of Mexico . Less predictably, perhaps, the author of the document was …