Survivor

On the 26th of April, 1986, Chernobyl's reactor 4 had a meltdown, it's control rods removed from place made it unable to shut down and the personnel operating the machine were inadequately trained.

On the 29th of April 1999, the world was introduced to humanity's worst achievement, Anthro-morphic Entities.

A mix, more or less, of STALKER and some other stuff.