The Rogell and Paesoss, a pair of Kiengoss class battlesubs cruise alongside the superheavy submersible battleship Vognoss, the lead ship of its class.
The Vognoss was designed for coastal bombardment and anti-aircraft saturation fire, along with over-the-horizon LRBM support. While the Vognoss was a potent surface combat vessel in of itself, it wasn't designed or tasked for submersible combat.
More on the Vognoss will come with it's "character sheet" picture. Enjoy!