Hope the Mods will understand that we sometimes stray to other sections in search of 'mission ideas'
So why not visit the following link and kill two birds with one stone. Particularly note that the Zip contains 'Enigma' - a nice piece of software explaining and illustrating the mechanics of the WW2 Enigma machine
http://www.subsim.com/radioroom/show...444#post455444
ACS Secret Mission 1
http://www.acsoft.ch/SH/ACS_SH3_SecretMission1-100.txt
http://www.acsoft.ch/SH/ACS_SH3_SecretMission1-100.zip
Hats off to ACSoft.