How are submarines recognized

Submarine Warfare: The Navy’s Greatest Secret was its greatest weakness

They looked for abandoned fishing nets - and found a copy of what is perhaps the greatest bankruptcy in the history of the secret service. According to the environmental protection organization WWF, research divers in the Geltinger Bay, part of the Baltic Sea at the exit of the Flensburg Fjord, recovered an Enigma encryption machine from the Second World War in November. With this, almost the entire military and political apparatus of the Third Reich encrypted its communications, which were sent by radio (and could therefore be intercepted).

"Although these machines were produced in very large numbers at the time, they are very rare and historically significant today," announced the WWF. It is estimated that between 1926 and 1945 a total of more than 40,000 copies were made, of which only a few hundred still exist, most of them from private collectors. Depending on the type and condition, they are traded at prices between the equivalent of 30,000 and 500,000 euros.

Apparently the cipher machine now found is a specimen with three rotors, as an X-ray image is supposed to show, not the most modern variant of the submarine weapon with the type designation M-4, which has been in use since 1942. In contrast to the Enigma versions of the rest of the Wehrmacht and the Nazi police, this had four rotors with which the letters entered were encrypted.