Ok, I'm gonna give you my two cents. If you want to take my advice, fine, if not, also fine. But please consider that multiple people have pointed out several issues and some have even made fun of some design decisions. I know that's not constructive at all, but it's a sign that something is not quite right.
Starting with the theme, I think the biggest issue is that this doesn't look like a submarine at all. We know how a submarine looks. We've seen the interiors a bunch of times in films and other games. This does not look like a submarine interior. If you're using the submarine from The New Colossus as a reference... don't. Counter-Strike is based around the present generally. It's alright to have some sci-fi elements here and there, but I think this is too much of a far stretch. If you want to keep the theme of having something underwater, just say it's an underwater base. At least that is more plausible.
As for the layout, I would also recommend to start over. I know you can't see why, but it's just littered with bad design decisions and no consideration for the way the game plays. I urge you to read this:
Good luck!