The 1973 Dyesebel movie directed by Emmanuel H. Borlaza was closer to Mars Ravelo's heroine mermaid. The character inhabits an undersea kingdom of mermaids, who were considered outcasts from the land of humans, due to the belief that mermaids
A group of communists, imprisoned in pre-war Yugoslavian dungeon, decides to escape when the war breaks out, having fears of possible shootings. Tunnel digging starts, but water endangers the way. The only solution is to assault the guards. In that feveri