This restriction only applies to singleplayer campaign, so in multiplayer and in mission mode, you should be able to start with whichever sub you choose.
Hello everyone! The last update of the year is coming next week. We named it “ Uncharted Depths”, naturally because of the environment overhaul that makes your journey into the unknown more scenic than ever. Even more importantly, this update rounds off this year’s efforts to lend our game the kind of depth its name suggests. So, let’s take a closer look – what does it actually contain?