#2 Most individual Soviet and Russian submarines are designated K for Kreyserskaya or Cruiser (B for Bol’shaya or Large if diesel or old), but only the Typhoons received the special designation of TK for Tyazholaya Kreyserskaya or Heavy Cruiser.

Project 941 Akula: The Majestic Typhoon Submarines from the Cold War era

#2 Most individual Soviet and Russian submarines are designated K for Kreyserskaya or Cruiser (B for Bol’shaya or Large if diesel or old), but only the Typhoons received the special designation of TK for Tyazholaya Kreyserskaya or Heavy Cruiser.

WWII