lol.. ya pielots...
This was kept secret to prevent USSR from obtaining this fully-operational-by-the-end of the war technological marvel. Even I thought I knew all the big things. Watch the "spam" movie: they canceled missions to terror-bomb major US cities on both coasts and Panama Canal to cut off Atlantic fleet & resources, because war ended and because of US retaliation.
Can't be too hard to program this into a nice graphics remake of PF+IL2. Something like Birds of Steel maybe?
USSR tho managed to developed the novel twin-hull concept into their most if not all their major boomer subs.