The Sound (2017) on Netflix

Plot summary

Kelly Johansen is a best-selling author who writes about the paranormal and investigates reports of the supernatural, though she is a skeptic herself. Ghost sightings have been reported in an abandoned subway station, and infrasound, the sound of the title, plays a large role in the story. Kelly attributes the sightings to low frequency tactile sound, and she enters the station to record evidence that will debunk them. Ethan is her fiancé. Clinton Jones is a maintenance man who works in the station tunnels. The story is purportedly based on true events.