Check out our list show about other ocean mysteries: www.youtube.com/watch?v=AxhObEpZcp0 Hosted by: Niba Audrey Nirmal (she/her) Emma Dauster: Writer Justine Ghai: Fact Checker Amy Peterson: Script Editor Savannah Geary: Editor, Associate Producer Daniel Comiskey: Editorial Director Sarah Suta: Producer Caitlin Hofmeister: Executive Producer Hank Green: Executive Producer Sources: www.researchgate.net/publication/223377110_Twelve_years_of_tracking_52-Hz_whale_calls_from_a_unique_source_in_the_North_Pacific asa.scitation.org/doi/pdf/10.1121/1.1593066 www.int-res.com/articles/meps_oa/m330p269.pdf Image Sources: www.gettyimages.com/detail/illustration/vector-illustration-of-a-blue-whale-royalty-free-illustration/1247826785?phrase=blue%20whale&adppopup=true www.gettyimages.com/detail/video/blue-whale-slowly-swims-in-blue-water-in-the-morning-stock-footage/1220613115?phrase=blue%20whale&adppopup=true www.gettyimages.com/detail/video/two-blue-whales-mother-and-baby-slowly-swim-in-blue-stock-footage/1141685272?phrase=blue%20whale&adppopup=true commons.wikimedia.org/wiki/File:A_hydrophone_node_(13466196874).jpg commons.wikimedia.org/wiki/File:British_mammals_(Pl._43)_(21269607064).jpg