'Trail-blazing' U.K. Attack Sub Proves Itself in U.S.
 

NORFOLK, Va. - HMS Astute, Britain's first new attack submarine in more than two decades, is the most advanced undersea craft ever fielded by the Royal Navy. But the sub's many improvements often have been masked by a long-running series of developmental and operational problems - including design issues, cost overruns, production missteps, lengthy construction delays, an embarrassingly public grounding last year in Scotland and a tragic shooting on board in April.

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