As Ken wrote:
About three years ago a small group of subsim forum members got an idea to increase realism in our SHIII/GWX game play. We wanted to, as much as possible, put ourselves in the shoes of a real U-Boot Commander. We named our group the "Enigma Flotilla" and posted a thread at the subsim forum telling the forum about us and asking for recruits to join us. We had about twelve members when we first started. After about six months our members started dropping off. At the time we were using the Enigma simulator to send messages while we were on patrol. As every one knows this program has a long learning curve. Eventually we only had four members left. The four of us put our heads together to discuss the mistakes we had made. We decided to disband the Enigma Flotilla and start a new flotilla. The Donitz Elite Flotilla was born.