Beneath Still Waters (2005)

Beneath Still Waters is a 2005 horror film, it was directed by Brian Yuzna and stars Michael McKell, Raquel Meroño and Charlotte Salt.

Synopsis: Studying under a disciple of Aleister Crowley, the leader of an upper class group invokes a supernatural force that slowly devours the village of Marienbad and its inhabitants, threatening to spread beyond its geographical limits. The mayor from the town nearby commissions the building of a dam which would flood the valley and therefore submerge the village forever sealing the evil force under water after leader and his followers were incapacitated to be kept from escaping. However, fate ensured the leader's freedom as he remained in the depths when the waters covered Marienbad. Now 40 years later an array of disappearances and deaths in mysterious circumstances are threatening the town next to the reservoir that now covers Marienbad.

It was produced in Catalonia. The film is the ninth and last film to be produced by Filmax's Fantastic Factory label. It's based on the novel Beneath Still Waters by Matthew J. Costello. It premiered on 24 October 2005 as part of the San Sebastián Horror and Fantasy Film Festival, followed with Spain theatrical release on 26 May 2006.