Submarine bells are underwater sound phenomena that occur when seismic waves from earthquakes or volcanic activity travel through the ocean. These waves can create low-frequency sounds that resemble ringing bells, which can be detected by specialized underwater microphones called hydrophones. Scientists study submarine bells to gain insights into oceanic processes and seismic events. By analyzing these sounds, researchers can better understand the dynamics of the Earth's crust and improve early warning systems for tsunamis and other natural disasters related to earthquakes and volcanoes.