Here is what is currently known about the sub:

- It can dive up to 600 meters deep and has a maximum speed of 16 knots on the surface and 31 knots underwater

- The submarine has a crew complement of 64 and an endurance of about 100 days, limited by food and maintenance requirements.

- The vessel’s armament includes 533mm torpedo tubes and vertical launch silos for Oniks anti-ship cruise missiles, Kalibr cruise missiles and Zircon hypersonic cruise missiles. Both Kalibr and Zircon missiles are nuclear-capable.