Sperm whales are loud. Male sperm whales pull this off thanks to a huge nasal cavity that can weigh more than five tons. Sperm Whales Are Basically Revving Their Engines Underwater, Study SuggestsThe actual reason they put this message out there is not completely understood. There’s no evidence yet that the whales are using this sound to chit-chat about the weather or whatever. For now, all they know is that sperm whales can get loud and don’t really care if you’re bothered by the ruckus.