Use the ARROW KEYS and A & Z to guide the whale. CLICK the stage to switch to MOUSE control mode.
All credit is due to NickyNouse for the original super-cool project concept. All I did in this remix was simplify the code for the swimming behavior (and add the ability to toggle between keyboard and mouse control). If you like this project, here's one with a jumping behavior: https://scratch.mit.edu/projects/121801949/