Based on your search for with English subtitles, you are likely looking for the Chinese creature feature Shuiguai (水怪)
The creature lifted its great frame. For an impossibly long heartbeat, it looked at the village—not with malice, but with the same curious hunger that humans had when they pillage and probe. Then, slower than any storm moves, it dipped back beneath the water. Where it had broken the surface, the sea was altered; eddies hunched like old men, and small silver fish puddled on the tide as if confused. water+monster+2019+english+subtitles+exclusive+download
Lena watched the footage in the library’s dim back room. Her face, usually a map of small jokes, went flat. When the credits—if you could call the rolling captions that—came to an end, she pressed her palm to the wood table like checking for a pulse. Based on your search for with English subtitles,