Blood Tide is a 1982 British film directed by Richard Jefferies. The film is also known as Bloodtide (in the USA) and Demon Island (American TV title).
A treasure hunter accidentally frees a monster, forcing local villagers to revisit the sacrifice of virgins.
See those women lying in a twisted pile of blood and bone
See those spirits flying by and everything is good
Take a walk on a beach of mine, enjoy the setting sun
Seems like everything around, you know there's something wrong
It's bloodtide, don't dare to wash your hands
You know it's blood, bloodtide
There's something beneath the waves, it slowly moves around
Everybody for themselves, it washes up on the ground
Gore and violence, smell of death, slowly walk away
When the ocean turns to red, there's nothing left to say
Winter from the blackest ghoul, gaping jaws everyday
Prisoner of the ocean, it's all that I can say
Join us for just one night, light a candle of pain