Amidst the chaos of World War I, a German U-boat torpedoes a British passenger liner, rescuing its survivors. As they navigate through a thick fog, the submarine unexpectedly surfaces near Caprona, an uncharted island that time forgot. Here, they encounter prehistoric dinosaurs and primitive Neanderthals, leading to a thrilling struggle for survival. The crew and passengers must navigate this perilous new world while confronting both the wonders and dangers that lurk within its ancient landscapes. What unfolds is a gripping tale of adventure, discovery, and the primal instincts that emerge in dire circumstances.