Austrian investigators Monday released more details about the elaborate underground cellar where Josef Fritzl kept his daughter imprisoned for 24 years, along with three of their children.
Investigators believe Fritzl planned to build the cellar as early as 1978, shortly after, according to his daughter, he began raping her at age 11 or 12, said police spokesman Franz Polzer.
The 73-year-old Austrian began building the dungeon as part of an addition to his home that year, and simply added the hidden space -- which was not recorded in any building plans -- Polzer said. It took Fritzl until 1983 to finish the addition, Polzer said. 
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All About Austria • Josef Fritzl • Elisabeth Fritzl