During World War II, the Germans used an encryption device called the Enigma, which Polish and English mathematicians worked tirelessly to crack.

Further topics explored include: - Changes and improvements to the Enigma Machine - The vast number of possible Enigma settings (10^23) - How the machine was broken by the Allies - The Bombe ...

Around 80 years after the war, Germany remains littered with unexploded bombs, often uncovered during construction work.