Memorias del Agua (2017)

The racism between their families forces Carla and Helena to keep their friendship as a secret. They both share a dream: to be Olympic swimmers. And for that, they train in secret in the city pool when it's closed. Carla gets selected by the national team, leaving Helena behind. One year later, Carla gets back to the swimming pool with the intention of talking to Helena, but that day, they're found and stalked by a stranger.