Horror manifold

You are group of rescuers search engines. Many weeks you were investigating a mysterious case. It all started when the couple Smiths adopted three children - twins and two ten-year-old their little sister. These children were found in an abandoned sewage and nothing about himself remembered. After a few happy months in the Smith family, one night, all three of them disappeared. Without waiting for the police rushed to search for the Smiths, and traces of children's feet on the wet ground led them to an abandoned reservoir. Since then, no one saw no children or their foster parents. And now you're standing at the entrance to the collector, and you have to go down and find out what secrets it hides.