Brand New Pool
Lisa continued a normal life upstairs in the Fritzl family home, and downstairs, Josef finally agreed to make their prison bigger. He obviously couldn't bring builders in, so he forced Elisabeth and her kids to do it themselves, setting his captives to work digging soil from the walls. It took months.
He couldn't continue to build without raising suspicion, so he also built a swimming pool for the rest of the family to enjoy as a coverup for the amount of soil being dug up in the basement. When the family splashed in their new pool, they had no idea they were doing so above Elisabeth's newly extended dungeon.
