Watch Killer Mermaid (2014) HD Full Movie Free on SolarMovie. Watch Killer Mermaid (2014) online free. Two young American women go on a Mediterranean vacation and uncover the watery lair of a killer merm...Two young American women go on a Mediterranean vacation and uncover the watery lair of a killer mermaid hidden beneath an abandoned military fortress. What was once a carefree adventure becomes a deadly fight for survival.