waves bombes
WWII Cryptography
The Bombe electromechanical codebreaking machines were used by WAVES (Women Accepted for Volunteer Emergency Service) at the U.S. Navy's Nebraska Avenue Building. The machines ran 24 hours a day, 7 days a week.

Bombes simulated the rotor movements of the four-rotor Enigma coding machine carried by German submarines. Allies used the knowledge gained from Enigma to help in winning the Battle of Atlantic which lead to the end of WWII.

Further Reading
The Secret History of the Female Code Breakers Who Helped Defeat the Nazis