Secrets of WWII:

The submarines types XXI and XXIII.
Past the war, stolen for USA and URSS, served from model for ulterior developments.

The type XXI are the first autentic submarine, all the rest "sumergibles"

In the case of the class of the US Navy Guppy development.
I think that the clase Tango of CCCP

And past the war, new secrets.

__________________
La llave de la libertad es la sabiduria. El cerrojo de la esclavitud la ignorancia

U-Historia, Ubootwaffe 1939-1945 History of UBootwaffe in Spanish
http://www.tradiweb.com/ta.htm Translator Web
http://www.forospyware.com In Spanish