Depending on who you ask, the last great submarine sim was one of the last few Silent Hunter games released between 2005 and 2010—all of which are surely heavily modded in some way.

Games Survival & Crafting Barotrauma Co-op submarine survival simulator Barotrauma has a free weekend on Steam, so dive in with friends and experience the most comically horrifying deaths you can ...

It's a simulation game with a focus on horror, and it is now set to get even better, as the new Home and Harbor DLC is coming to the game sometime next year.

The hyper-realistic simulator type games probably appeal mostly to those with a devoted love for the topic at hand, whether it be trains, planes, automobiles or in this case submarines.