Swim like a Dolphin

Fridolf is getting swimming lessons in his local swimming pool, but it's not your usual teacher. Neither is Fridolf your average boy, he lives in his own world and can see and hear beyond and beneath, and when he enters the dilapidated swimming pool he hears seagulls and feels sand crunching between his toes. His dad doesn't swim, he never does, not since he got attached to his dumb phone. What happens when Fridolf splashes his dad's phone and what are sharks doing in the swimming pool?