The Enigma coding machine was a unique feature of the Wermacht during the war. All other forces used it also but the Kriegsmarine
Enigma coding tool was one of a kind.
Later the code breakers in Bletchley Park after months of trying, were able to break any message that was send out by
a submarine and any message that the BdU was sending out to the U-boats. This was the end of the German submarine force and
its famous Enigma coding tool.
The Enigma coding tool that was used by the Kriegsmarine had 2 versions.
The first one had the standard 3 rotor mechanics and the second one that had 4 rotor desing for extra protection and was
much more difficult to break than the original version.
The name of the second machine called "SHARK" and through the 4 rotor mechanism was able to encrypt to a level
that was astronomic the time it was build.