SEATTLE--A metallurgist in Washington state pleaded guilty to fraud Monday after she spent decades faking the results of strength tests on steel that was being used to make U.S. Navy submarines.

China has ramped up its production of nuclear-powered submarines over the past five years to the point where it is launching subs faster than the United States, threatening to negate a sea-power ...

This month, a welder at a Virginia shipyard etched the keel plate of the USS Barb, the ceremonial birthing of a new submarine. The Virginia-class fast attack submarine joins hundreds of Navy subs ...

For decades, the Navy's leading supplier of high-strength steel for submarines provided subpar metal because one of the company's longtime employees falsified lab results — putting sailors at greater ...