This film continues the story of radio operator Ludwig Bartuschek from “The Sailor’s Song”. Near the end of the Weimar Republic, Bartuschek (Erwin Geschonneck) is working as a mechanic in the Sperber airplane plant. Director Dehringer offers him the opportunity to train as an airplane constructor if he is willing to give up his communist beliefs under oath. Bartuschek will not allow himself to be bought and instead joins the underground resistance movement.

A film about the historical uprising of the seamen in Kiel: During the Russian October Revolution of 1917, German and Russian soldiers start to solidarize with each other. By disarming the officers, machinist Henne Lonke and stoker Jens Kasten prevent the attack on a Russian freighter. When German admiralty gives out orders for operation "Nibelungen", which would lead the German fleet into a suicidal attack against England and quell the revolutionary spirit, seamen and soldiers from different political backgrounds unite in protest.

Geheimakten Solvay ist ein antiwestlicher DEFA-Propagandafilm

Bad planning and shortages prevail on an East German construction site. Foreman Hannes Balla uses unconventional methods to overcome the problems. New Socialist Unity Party secretary Werner Horrath is charged with bringing the rough-and-ready builder crew into line. The task seems doomed to fail as the two men compete for the affections of young engineer Kati Klee. But when she gets pregnant by married man Horrath, he is in danger of being expelled from the party, and Balla takes his side...