Seascapes. Types of Leningrad. Monument to Peter I, Admiralty, cruiser "Aurora". Shlisselburg Fortress in the Leningrad Region. Combat exercises of ships of the Baltic Fleet and naval aviation. Sailors run across the deck during a combat alert; boats at sea; seaplane B-12 sits in the sea and picks up the boat; people from the boat go to the plane. Sailors take exams in practical training. Polish sailors with their wives sit at tables in a cafe before going to sea. The singer performs a song in a cafe (synchronously). Raising the flag on the submarine "Belik" of the naval forces of the Polish People's Republic. The submarine commander G. Kulya and the sailors on the submarine. Monument to the hero sailors of Westerplatt, who died at the beginning of the Second World War. German cruiser "Schleswig-Holstein" in the port of Gdansk; submarine officers. Types of Gdansk. City streets, port; harbor cranes are working. Ships in the roadstead in the port of Tallinn. Types of Berlin. Citizens on the streets of the city. The President of the House of the People, G. Göting, delivers the Stockholm Appeal to the Chairman of the Peace Committee, Professor Dreyfal. Ship of the People's Navy of the German Democratic Republic at sea. Sailors wash the deck, dine, run across the deck during a combat alert. A friendly meeting of German, Polish and Soviet sailors. Joint exercises of the fleets of the Warsaw Pact countries with the participation of surface ships, submarines, aviation and marines (black and white, countertype). Command of the three headquarters at the map. Ships at sea. The ship leaves the water and moves along the ground. Joint fighting. Photos of NATO ships. The film shows veterans of the Great Patriotic War, warrant officer A. Ye. Sikorsky, defender of the Shlisselburg fortress A. G. Morozov, Hero of the Soviet Union, former commander of a torpedo boat Lieutenant-Commander B. P. Ushchev. Interview with Professor Dreyfal, the commanders of the German ship K. Shefer, the Polish submarine G. Kul, the son of Rear Admiral S. N. Avraamov - a cadet of the Nakhimov School (synchronously).