Mysterious Island (1961)

During the US Civil War, Union POWs escape in a balloon and end up stranded on a South Pacific island, inhabited by giant plants and animals. They must use their ingenuity to survive the dangers, and to devise a way to return home. Sequel to '20,000 Leagues Under the Sea' . exotic island, based on novel or book, submarine, escape, war correspondent, jules verne, cave, hot air balloon, beehive, giant insect, romance, giant bird, stranded, marooned, pirate, struggle for survival, giant animal, confederate soldier, escaped prisoner, cooperation, american civil war, noblewoman, prison break, captain nemo, giant crab, volcanic island, ammonite, food supply, union soldiers, anti-war activist, atomic power