Cuba. Havana city. Workers, employees, students after a hard day as members of the people's militia with weapons guard city facilities, are on duty at posts. Calculation of soldiers at the anti-aircraft gun. American destroyers in the Gulf of Mexico. American military base at Guantanamo. A Cuban border guard with a machine gun on the border of Cuba with an American base. American plane over the island of Cuba. Cuban interceptor fighter planes take off on alert. An anti-aircraft missile rises on the launch pad. Tanks are walking across the field. A fire on a sugar cane plantation. Fire extinguishing. Soldiers-border guards are leading a group of captured counterrevolutionaries. Harvesting sugar cane manually and using combines produced by the Lyubertsy Combine Plant. The combines are operated by Soviet and Cuban combine operators. Processing of sugar cane at a sugar factory. Fidel Castro at a cane plantation, at a sugar factory, speaks at a rally, presents certificates to Soviet Komsomol members who helped in harvesting sugar cane. Soviet, Cuban and Czechoslovak specialists working on the restoration of technological processes at the nickel plant in Moa. A walking excavator loads nickel ore into American-made dump trucks. A section of a railway line overgrown with grass. Representatives of the Soviet and Cuban delegations sign an agreement on the supply of diesel locomotives to Cuba. Diesel locomotives with trains arriving in Cuba from the Soviet Union. Soviet, Polish, Bulgarian ships, tankers in the port of Havana. Baku and Cuban oil workers, deep-hole drilling experts work at the drilling rig. Construction of a thermal power plant, among the builders of the Soviet engineer L. Gaponenko. Cuban students studying at the Moscow Power Engineering Institute, at the Agricultural Mechanization School in Holguín, Cuba. Classes in the ballet class of the Hawaiian School and the Arts. Hospital named after Lenin in the city of Holgin, equipment for which was delivered from the Soviet Union. Installation of a housing and construction plant - a gift from the Soviet Union to the Cuban people. Soviet fish trawlers are fishing off the coast of Cuba. Research vessel "Akademik Kovalevsky" with Soviet and Cuban oceanographers on board, conducting research of ocean soil. Economy of the national estate: poultry farm, livestock farm. Rice field. Construction of irrigation facilities. Production processes in the shops of a cement plant. A group of Cuban steel workers on an internship at the Volgograd Metallurgical Plant "Red October". Production of metallurgical equipment for Cuba at the Ural Heavy Engineering Plant. A visit to the plant by a Cuban delegation headed by F. Castro; the delegation is accompanied by the 1st secretary of the Sverdlovsk regional committee of the CPSU K.K. Nikolaev. Meeting of workers of Uralmash; F. Castro speaks.