You might know what a hydrothermal vent looks like: black plumes billowing from deep-sea pillars encrusted with hobnobbing tubeworms, hairy crabs, pouting fish. But do you know what a hydrothermal vent sounds like? To the trained ear, the Suiyo vent sounds like many things. He has listened to the sea since 2008, and to the deep sea since 2018. He published these recordings in August at a conference of the Deep-Sea Biology Society.