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Container ship two months ago killing seven sailors. >> well conduct a full and thorough investigation into this collision, what occurred, what happened and how it happened. one tragedy like this is one too many. >> reporter: navy divers now weaving through the mangled maze below deck. and for the families of the "uss mccain," an agonizing wait. 22-year-old kenneth smith is among the missing. >> i just want to be over there searching. his father and i couldnt be prouder of our son, hes a great k...