The paper deals with sonic surface in a modern turbine wheel consisting of non-prismatic ultra long blades. The whole inter-blade channel is choked. Different positions and shapes of the sonic line in particular cross-sections along the span are observed. https://www.diegojavierfares.com/super-super-Proven-Winners-reg-Fun-And-Games-reg-Eye-Spy-Foamy-Bells-special-save/