Project Arcturus is newest Russian nuclear ballistic missile submarine concept, presented on Army 2022 forum by Rubin design bureau.

Length: 134 m (439.4 ft)
Width: 15.7 m (51.5 ft)
Crew: ~100 people
Missiles: 12 ICBMs
AUVs: several Surrogat-V anti-submarine drones

Arcturus is announced to enter service in 2037, replacing Borei-class submarines.
Its main task will be arctic warfare and stealth missions in northern seas.

Only schematics (requires Litematica mod)