The next nuclear-powered submarine Northrop Grumman Corp. will deliver to the U.S. Navy passed a key construction milestone Sunday as workers completed the final hull welds on the New Mexico.The process, called "pressure hull complete," means the submarine's four hull sections have been joined together to form a single, air-tight unit.
New Mexico, the sixth boat of the Virginia class, is scheduled to be christened later this year in Newport News and handed over to the Navy in 2009. The sub is expected to be finished eight months ahead of schedule, Northrop officials say.
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