Scientists working at The University of Manchester have shone new light on the Enigma machine used by the German military in World War Two and cracked by Alan Turing and his team of code breakers at Bletchley Park.

Using X-ray Computed Tomography (CT), features inside the Enigma’s metal casing were revealed, including the wiring and structure of the rotors that encrypted messages sent using the machine.

The CT technology, part of the Henry Royce Institute for Advanced Materials, works by collecting a series of X-ray radiographs which are then reconstructed into a virtual 3D replica.

Professor Philip Withers, Chief Scientist at the Henry Royce Institute and Regius Professor of Materials at The University of Manchester, said: "Normally Royce facilities are probing new materials to solve engineering problems in industry but when we were approached we were keen to help. Gaining a first look inside the Enigma machine required us to take over 1500 separate x-ray radiographs. It is exciting and appropriate to be able to unlock some of the secrets of such an iconic machine here at Manchester."

The 1941 German army Enigma machine was loaned to the University by Bletchley Park and its owner, cryptography enthusiast, David Cripps. It is the latest Enigma machine to be verified and one of only 274 registered. Made in Berlin in 1941, the machine is believed to have been supplied to the Austrian Federal Ministry of the Interior in Vienna.

Enigma machine owner David Cripps said: "One thing we’ve been able to do is actually look inside the rotors and see the individual wires and pins which connect the 26 letters on each of the three rotors, enabling a message to be encrypted. This is the first time anyone has been able to look inside the Enigma with this level of detail, using a technique that does not damage the machine."