Rollercoaster 4K 1977

Several serious accidents occur at various amusement parks across America. Maintenance supervisor Calder suspects that this is no mere coincidence and begins an investigation. It soon becomes clear that an unknown perpetrator is turning one ride after another into a nightmarish killing machine by planting radio-controlled bombs beneath them. The terrorist demands that his conditions be met; otherwise, he will blow up the biggest ride—the Russian Roller Coaster. Will the FSB be able to track down the criminal before he carries out his diabolical plan?