Something in between a diving bell and a submarine. It was brilliantly designed and definitely on its way to a modern submarine.
John Holland was a contemporary and must have been following the news of the submarine build.
Could he have even met the builder ?
Alexander Engel 1/48th scale Gato
Graupner MC-19 radio converted to 75MHZ
"Anything one man can imagine, other men can make real." — Jules Verne