Our 'greatest unsung hero': Irish librarian credited as Nazi codebreaker

An unassuming Irish librarian has been credited as a Nazi codebreaker who helped to alter the course of the Second World War.

Hollywood movie The Imitation Game brought the work of mathematicians in Bletchley Park, England, in decrypting morse code messages from German spies during the Second World War to the big screen.

A lone Irish codebreaker genius, Dr Richard Hayes, was back in Dublin during the Nazi conflict helping to crack impossible ciphers from Berlin agents.