Underwater sounds are noises that travel through water, which is denser than air. These sounds can come from various sources, including marine animals like whales and dolphins, as well as human activities such as shipping and fishing. The speed of sound in water is about four times faster than in air, allowing sounds to travel long distances. Marine life uses underwater sounds for communication, navigation, and hunting. For example, sonar technology helps submarines and ships detect objects underwater by sending out sound waves. Understanding underwater sounds is essential for studying ocean ecosystems and monitoring the impact of human activities on marine life.