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An explosion in the hull of a cruiser during routine maintenance left six workers injured Saturday, one of them critically with life-threatening burns, authorities said.</p>
<p>Subcontractors from the National Steel and Shipbuilding Co. were working in the fuel tank of the cruiser Lake Champlain as it sat in dry dock when the explosion occurred just after noon for reasons not yet determined, said San Diego Fire Department spokesman Maurice Luque....
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