First sub The Intelligent Whale built in 1864. Cost $60,000 to build. Condemned in 1872. It is 28.8 ft. in length, 9 ft. deep. 1/2 inch thick iron - Brooklyn Navy Yard.

First sub The Intelligent Whale built in 1864. Cost $60,000 to build. Condemned in 1872. It is 28.8 ft. in length, 9 ft. deep. 1/2 inch thick iron - Brooklyn Navy Yard.

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