German WW-II Navy M4 Enigmas Recovered from Sunken U-Boat

Most of the German WW-II Navy Kriegsmarine Enigmas went down with their ships and are now in rather poor condition after 60+ years on the bottom of the ocean. Here is an example of a marine Enigma that was recovered from a submarine off the East coast of the United States in 2001.
As you can see, there is relatively little left of this historic cipher machine.

These images are displayed with the permission of the divers who recovered the machines and with the permission of Dr. David Hamer, the curator of the website where they and many other photographs are displayed: