Not surprising since i remember that i evaluate the amount of time it would have take me alone to make such a game and i came to roughly 10 to 12 years!
You have to model all the ships and there was an astounding amount of them both merchants and military.
You need to have a solid team to make something like that and also you have to go with your time and simulation are almost a dead genre today.
I am not developing any submarine game it’s already mention in upper post, it is simply a project i did to learn how to get to speed in Blender and i am only working on it spare time like 8 to 10 hr weekly.
I also want to give back to this community since they give me a lot so i plan to release video tutorials about an advanced ocean shader including underwater + everything i made for this project except the submarine since i don’t want to see it for sale on turbocrooks or any other 3d models Shylock out there.