The Pool (Blu-ray release 2019-5-15) is a Thai horror movie about a man being trapped in a dried swimming pool, with a CG crocodile to accompany him.  There is no mystery about how there can be a crocodile.  It literally climbs out of nowhere and crawls into the pool.  This is an incredibly stupid movie from start to finish, with the protagonist making the stupidest decision that could possibly be made in order for the movie to exist.  At the beginning of the movie when his friend tells him the water of the pool is being flushed away, he chooses to sleep on the waterbed instead of leaving the pool, and traps himself.

Warning: Dog lovers should stay away from this movie.  Even I do not own a dog, I find this movie tasteless.