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Dean Ackman explains the problem with the ballast leak in his submarine to friends at the Knife River Marina Thursday. Ackman built the submarine himself and was attempting a test run when he discovered the leak. Bob King /

Duluth man will explore Lake Superior in his yellow submarine

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Driver after driver craned their necks for a better look as the sleek steel machine passed by them on Highway 61 through Two Harbors.


Top hatch, rear propeller, bottom ballast tanks, bright daffodil color -- could it be? Yep, it was a real-life home-built yellow submarine, on its way Thursday to the Knife River Marina for a test of its lake-worthiness.

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