... the BEST Soviet/Russian submarine (1903-2019) website is probably this one:
https://www.soumarsov.eu/
This site is in French but Google translation or other device can convert easily into English.

Full of histories, data, sketches, pictures, etc... A real gold mine.
In the past this author has fell victim of piracy, so he's asking for your IP address to open free and complete access to his site.
You'll have to write to him to get permission. Quick and easy. Follow instructions on the title page.