Find out the title of the black & white movie that burned nightmarish images into my head as a child

I saw a very small portion of some old black & white movie when I awoke in the middle of the night and walked into the Living Room where my aunt (who was baby-sitting us at the time) had the TV on but was busy talking on the phone. She didn’t notice I was awake. The scene appeared as if it being seen through a child’s eyes of a drowning—-with an older woman (caretaker? nanny?) looking down at the drowning person from above the water. The shot looked like it was viewing up from under the water.