Warning! This is not a swimming pool

Summer is coming, and I really want to find a swimming pool to jump into. However, when you see this one, you need to be careful. It seems to have no significant difference compared with other swimming pools. In fact, the water level is only about 10 cm thick on the surface. Beneath it, there is a huge water curtain cave separated by transparent glass for visitors to visit. The scene is like Poseidon's underwater palace...