While playing a game, press B to display the communication panel, type "cisco 
sez", then press [Enter] to enable cheat mode. Press B to display the 
communication panel, enter one of the following codes, then press [Enter] to 
activate the corresponding cheat function:

Result - Cheat Code
Invisible to opponents - engage cloaking device 
Destroy selected target - boom 
Display all targets on sonar - see them 
Super torpedo - eat lead
Repair damage - heal me
Change targeted sub or ship to be friendly - be my buddy
Turn submarine around - flip her
Submarine can fly - zepplin
Stop submarine - drop anchor