Aha ! Smithsonian Channel comes through again .
Here's a submarine no one remembered . This machine is very fascinating . Cast iron and wrought iron together to make a submarine in the 1800s .It had a screw and rudder ( Now gone ) . It dove and surfaced actively . Unlike the Hunley .
True the Hunley could dive . But the Explorer could do it with compressed air . How she wound up off an island on the beach below the high tide line on the pacific side of Panama .( At high tide you wouldn't even know she was there ) .
I am tempted to try to build a facsimile . Although I think " G " Morrison could do it better . Does anyone want to try ? Either way , it is a fascinating and compelling story of inventiveness in 1800s America T.B.