Rex is digging up facts...
Tanya Rubtsova
Narrator (voice)
Vera Sterlikova
Galya Shopina
Mariya Vinogradova
Narrator (voice, uncredited)
Lev Lyubetsky
Aircraft designer (voice, uncredited)
Vasiliy Livanov
Factory worker (voice, uncredited)
Roman Filippov
Miner (voice, uncredited)
Vladimir Tarasov
Genrikh Sapgir
