First sub 'The Intelligent Whale' built in 1864. Coast $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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Sub S-19 in Navy Yard.
Sub V-2 in Navy Yard.
Submarine being overhauled, Philadelphia Navy Yard drydock
Sub V-1
Sub V-2 in Navy Yard.
Sub S-19. Navy Yard.