The Volga-class is the successor of the Baikal-class. Combat experience against Celestial Being (CB) made the ESF realize that their ships, even in superior numbers, was just no match for a single CB battlecruiser. To create a combative edge against CB and future threats, a new class of ship was needed, but with a vow of pacifism in future endeavors, a massive ship re-fit was decided instead.
Building on top of the pre-existing Baikal-class, ESF engineers added an entirely new module section to the aft of the ship with new system enhancements. A pair of MS hangers was added to expand the port and starboard of the ship and increased its MS support capacity. Attached to the new MS hangers are a pair of GN Engines on each side (suggestively each installed with 4 GN T Drives). A series of support beams were added to the aft to support the overall weight and structure of the new module. Its held together by a bridge platform that connects the two hangers together. The new additions were designed to limit obstructing the original capabilities of the Baikal-class; most if-not-all the original capabilities of its former class remains.