Fun fact: The Russian Revolution of 1917 went underway when the Russian Navy joined in. I believe it happened just after Bloody Sunday, but I can’t find it now. Anyone here remember what the catalyst was for the Russian Navy on some island to join the Russian Revolution?
That submarine was trailing the Russian ships the whole time, the Russian ships had no idea, and there are more submarines in the waters nearby. The whole purpose was to show the Russian ships that they are sitting ducks.