"The La La Land That Time Forgot"

From imdb and imdb:

In Hollywood in 1916, during the World War, a British passenger ship is torpedoed by the German U-boat commanded by Captain Von Schoenvorts and sinks.

The survivors Mia and Sebastian join a few crew members that have also survived and convince them to take over the submarine that has come to the surface. Mia is an actress who moved from small town Nevada and dropped out of college five years ago to pursue her dream. Sebastian is a jazz pianist, his style of jazz in the vein of traditionalists like Charlie Parker and Thelonious Monk.

They sail together but they end lost in the middle of the ocean. Partly because of their individual struggles and partly because of the situations, their initial couple of chance meetings are antagonistic ones. After many incidents, the two team-up with the German crew to survive and arrive in Caprona, a land that is not charted in the maps.

However, there are many obstacles to a Mia/Sebastian happily ever after. Soon they realize that the land has dinosaurs, pterodactyls and Neanderthals. They capture a native, Ahm, and they learn that his dream is to open his own jazz club, most specifically in what used to be a famous jazz club that has since been converted to a tapas bar cum salsa dance club.

They see the chance to re-open it and leave Caprona. The pursuit of their individual dreams may take all their energies, with nothing left for escaping from the island. Will they succeed in their intent?