Subhunt is an interesting submarine mission simulation game developed by a group at a university game development lab: Laboratory for Recreational Computing at the University of North Texas, which still exists today. Apparently it was coded entirely from scratch using no existing libraries in C++ and Assembly. Anyways, it's a submarine simulator, so there are lots of buttons and things to press, and you'll need to spend some time learning how everything works because this is not an arcade-type sim. It does provide you with a 3D-rendered view outside your sub. The full game contains 12 missions but only one is included in the shareware game.
8/18/2024