>> in fact, that is what i told the captain when we got on the radio. he said, how big is the hole? i said it's big enough to drive our boat through. >> and it was getting worse. >> we could hear it crack and groaning. we could watch the sides of the ship starting to spread up the side like a tuna can. >> 8 of the 11 cargo tanks were ruptured. millions of gallons of oil were billowing out. and no one yet knew why. at that point, are you still calm? >> well, i'm trying to be calm. i'm trying to figure out what do i do next? when we come back, investigators learn about a dark secret from the captain's past. >> i abused alcohol, yes. but i wasn't addicted to it. when you have diabetes like i do,