Atlantis

After his transport ship went down at sea, Hercules found himself on the shores of Atlantis. There he met Cassandra, a beautiful woman whose premonitions told her Atlantis was doomed. But King Panthius, scorning Cassandra's warnings, arrested the young woman and her new friend Hercules. Soon they learned Panthius' crystal-powered cannon had caused Hercules' shipwreck, and enslaved sailors worked the kings crystal mines. Escaping the torture chamber, Hercules freed the sailors and came back for Cassandra. They soared away to safety in a glider as the foundation of Atlantis crumbled, destroying the island city.