Tom Clancy's SSN

Tom Clancy's SSN is a simulation of the 688i (i.e. Los Angeles-class) nuclear hunter/killer submarine. The player commands the USS Cheyenne in a limited war against China over the Spratly Islands in a 15-mission campaign where they'll perform a wide variety of missions from patrol to escort, from boomer hunt to convoy attack.

The game uses a large number of video briefings and "news" reports to enhance the atmosphere both before and after the missions. During the mission, the player can see their submarine in a 3rd-person view with a rotate-able camera (only horizontally though). The player is limited to only torpedoes (no Harpoon anti-ship missiles). While VLS (vertical launch system) is included, it has no real effect in the missions. Sonar is vastly simplified, leaving the player only with command decisions such as where to turn, what depth to go to, when to shoot, when to use active sonar, when to deploy decoys, and so on. Thermal layers (large difference in water temperature, affects sonar performance) is simulated.