There were a vast number of campaign missions and, if repeated, they were always random in location as well as types of ships involved, a truly dynamic campaign. Subsim skippers are never satisfied with "canned" missions and this contributed to the success RSR enjoyed. Some missions include only submarines, others include only a surface convoy, others include a surface task force (with carriers), and others with both ships and subs. Helicopters with sonar dipping equipment and sonar buoys add much to the turmoil. With the most challenging settings, events get so complex, and events occur so quickly, that having two people at the keyboard is a great help, and for beginners, almost a necessity (plus it is more fun). Trying to identify ships with signature analysis, running from incoming torpedoes, launching noise makers and decoys, dealing with several of your own wire-guided fish, and launching Harpoon and Tomahawk missiles makes for a very busy captain. Overall, a great submarine simulator that's still being played today. Highly recommended!