A group of temporary workers arrive at the Czech-German border to conduct geological exploration. However, not all people have pure intentions and a past, and so the group of geologists is threatened by saboteurs who want to blow up an abandoned mine and escape across the border...

Josef Vinklářas Antonín Homolka
Stanislav Fišeras Ctirad
Rudolf Deylas Stein
Rudolf Hrušínskýas locksmith Alois Pohanka
Miloš Kopeckýas Melichar Hnátek
Robert Vrchotaas Ludvík Mikola
Josef Kemras paleontolog Frantisek Jezek
Stella Zázvorkováas Kveta Vejdovoda