The object is located at the ground around the pool, which is 5 meters deep, if the index of refraction of water is equal to 4 will see the object is from the surface of the water a few meters.
The object is in the pool, which is five meters deep if the refractive index of water is equal to 4 to see objects within a few meters deep from the surface.
The objects on the floor the pool depth 5 meters. If the index of refraction of the water equals 4 will see objects in deep from the surface a few meters.