ABC Covers Story about finding the USS WAHOO SS-238
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Finally tonight, a World War II mystery that's been solved with the help of some families who never forgot and never gave up. for 63 years, a sunken american submarine, the ""USS Wahoo,"" rested somewhere at the bottom the sea. But no one knew exactly where.
Now, the answer and the ""Wahoo"" have been found off the coast of Japan. Here's ABC's Ned Potter on the determined people behind the discovery.

Reporter: This story is about a submarine. But perhaps it's best to begin here, in the hills near trout run, Pennsylvania. When Bobby Logue was a boy in the 1930s, he loved to go hunting here near the family home.

My grandfather bought this house here in 1884.

Reporter: this is his younger brother, george, who worshipped him.

When he was killed, dad told me. He says, ""George, from now on, you're the man in the family.""

Reporter: Bobby Logue joined the navy out of high school and wound up on the crew of the ""USS Wahoo."" It became one of the most celebrated submarines of World War II.

My father took over the sub in 1942.

Reporter: Doug Morton is the son of the ""Wahoo's"" commander, a charismatic young man whom everyone called ""Mush"" Morton.

And he said to them that we are not going to sit around. we are going to go out and kill 'em.

Reporter: Morton's crew sank at least 19 japanese ships, more than any other submarine of the time. But then, silence. In October, 1943, the ""Wahoo"" was supposed to be in a very dangerous place, the La Perouse strait, right here off the coast of Japan.

And I come home from school one day. and my mother waironing. and she was crying.

I was 4. All I know is how i reacted when she said, ""lost at sea."" I said, ""well, why don't they find him?""

I wasn't going to settle for that. when i heard ""overdue"" and ""presumed lost,"" I said, ""like hell. I'm going to find out what happened to the 'wahoo.'"" I was just a kid.

Reporter: For decades, george logue searched. He got help from Japanese researchers who found records that an American sub had been fired upon in the la perouse strait. A Russian diving team joined in. And there, in 200 feet of water, they found the wreck of a submarine.

It's just nice that there's a place now. I'm glad it was found. I'll never forget about Bob. He loved these hills up here. This is being close to him.

Reporter: just being here?

Yeah, right here.

Reporter: right here. ned potter, abc news, trout run, pennsylvania.