After Yang Ling moved the shaken and dazed piranhas into the Wizard Pagoda's dimension, he verified that there weren't any other piranhas in the vicinity. After he ascertained that he wasn't in danger, he swam carefully toward the island at the center of the lake.
The lake's water was bone-chilling. and its chill reached his bone marrow. The closer he got to the island, the colder the water became, and Yang Ling felt like he was within 10,000 year-old ice. He felt a chill, and his limbs turned ice-cold and numb. It seemed like even the blood within his body had almost been frozen and turned into ice.