Epic true WWII story about the Soviet rocket launcher nicknamed \"Katyusha\", that was kept shrouded in secrecy. During WWII, a Soviet rocket launcher nicknamed \"Katyusha\", was kept shrouded in secrecy. It was super powerful but would be lethal in the wrong hands. Disaster strikes, however, when one of these unique killing machines is drowned during an unexpected retreat of the Russian troops. A special unit formed of ex-athletes is sent to rescue the secret weapon, to ensure the Germans can never find it – no matter what it takes. Based on an amazing true story.