DEEP IN A ROMANIAN FOREST, SCIENTISTS STUMBLE UPON THE RUINS OFA 13TH CENTURY ABBEY BUILT OVER THE ENTRANCE TO AN UNDERGROUNDCAVE SYSTEM. THEY HIRE A GROUP OF AMERICAN CAVE EXPLORERS TOINVESTIGATE THE CAVES. BUT THE GROUPS ESCAPE ROUTE IS CUT OFF &THEY ARE HUNTED BY THE MONSTROUS CREATURES THAT LIVE DOWN BELOW.