Project 690M Klyon

[World B4]

I've seen it spelled Klion as well. Project 690M was a successor design to the Project 690 Bravo training submarines. Designed by the Lazurit bureau, it was to displace 3,000 tons, a 50% increase over the 690. Hull section testing articles were manufactured and experimented on in the mid 80s, but the project hadn't gone further than that by the time the country collapsed. Deepstorm has a detailed page on the design. I can't find any diagrams or illustrations, and I'm pretty curious what this would have looked like.
https://www.deepstorm.ru/DeepStorm.files/45-92/dns/690m/list.htm