Powerful volcanic eruptions and tremors shaking the entire planet suggest to Dr. Jake Rollins that something strange is happening to the Earth. His suspicions are confirmed at a secret military complex. Trying to penetrate the Earth's core in search of an alternative energy source, scientists have damaged its shell, and now a sea of lava threatens the Earth with a powerful earthquake. Fearless scientists led by Jake embark on an expedition in a unique supermachine to patch the breach in the Earth's fiery heart! They will overcome stone mazes, acid lakes, rivers of lava and toxic gases, but will the daredevils be able to save mankind before the Earth splits apart?!

Jules, a young mail carrier, is obsessed with opera and in love with an opera diva who, as a matter of principle, does not make recordings of herself singing. Jules secretly records her voice to enjoy it alone, but finds himself drawn into the dangerous games of criminals. In addition, he accidentally witnesses a murder and becomes the owner of another audio cassette.