London, Aug 20 : Dungeon girl Kerstin Fritzl ripped out handfuls of her hair in frustration during her cellar ordeal, it has emerged.

Shocking details of the torment of incest dad Josef Fritzl’s cellar children have emerged for the first time. It has been revealed that they ripped out their hair, tore off their clothes and blocked their dungeon toilet in a bid to show their mental torture.

And at least one still walks with a back-breaking stoop from almost two decades of being unable to stand upright.

Monster Fritzl’s daughter Elisabeth, 42, spent 24 years as his sex slave and was held captive with three of her six children by him – Kerstin, 19, Stefan, 18, and Felix, six.

Kerstin has told police that she would tear off her clothes and block the dungeon’s single loo to hit back at her tormentor.

Kerstin spent weeks in a coma after her rescue in April.

“Kerstin has closed the door on many dark things that have happened to her and she may never be well enough to open it,” The Daily Star quoted a family pal, as saying.

Stefan is still facing massive physical disabilities from his life in the cellar. Doctors are teaching him how to walk again because the low roof on the cellar left him with a stoop.

“He is 5ft 9ins and at its tallest point the cellar was only 5ft 7ins. In places it was much lower. But Stefan still shuffles around as if still there,” added the pal.

Doctors believe Felix is the only one who has a chance of a normal life. (ANI)