Subwar 2050 is a futuristic 3D submarine simulator computer game. The game was released in 1993 for DOS and 1994 for Amiga and Amiga CD32. In 1994 an expansion pack, Subwar 2050: The Plot Deepens was released for DOS.
Source: Wikipedia, "Subwar 2050", available under the CC-BY-SA License.
This scenario disk adds three new campaigns (Bermuda Triangle, Mediterranean and North Cape) plus additional submarines and weapons.