OSLO, Norway (AP) - A Norwegian family's swimming pool wasn't just bolted down. It was in the ground. But that didn't stop a band of determined thieves. When the Nicolaysen family visited their mountain cabin over the weekend, they discovered a big hole in the yard in place of the swimming pool that had been installed 20 years ago. "This can't be, we thought," Arild Nicolaysen told state radio network NRK on Monday. "We didn't think it was possible. No one can steal a swimming pool." Evidently, someone did. At some point since early November, when the family closed up the cabin for the winter, their five-metre-diameter pool and all its equipment was uprooted and stolen. "It must have been a terrible job to disassemble such a big pool," Brit Nicolaysen said. "There is a steel lining all the way around, plus there is a plastic liner and then there was a skimming system, a filter system and a lot of big hoses, and pipes." Police said they had never heard anything like it. They suspected the pool was taken for someone's private use.