A group of children from 1930s Prague follow the news about the polar expedition of the Chelyuskin, whose members find themselves stranded on a floating crust after the shipwreck. The rescue operation they had planned eventually turns out to be an aid to the striking workers of Děčín...

The Pioneers are leaving for a holiday camp for young astronomers. And it's going to be an interesting stay, as a large meteorite was observed falling shortly beforehand, and it looks like debris fell into the area around the campground.