In the 1990s, deep beneath the Pacific, a Cold War-era hydrophone network built to track enemy submarines began picking up something strange.
Louder than any known animal. Deeper than any ship. Stranger than anything scientists had heard before.
They called them the Bloop. Julia. Upsweep. Slow Down.
Each one a bizarre sound echoing from the deep — some lasting seconds, others hours — recorded on NOAA’s massive undersea listening arrays.
Were they icebergs? Volcanoes? Whales?
Or something still unexplained, echoing through a part of the ocean no one has ever seen?
In this episode, we dive into the most mysterious underwater recordings ever captured: the chilling NOAA signals that once sparked fears of sea monsters… and still puzzle scientists today.
Enjoyed the Deep Dive?
Don't forget to follow the show so you never miss an episode!
If you liked this one, leave a comment, share it with a friend, and leave a rating — it helps us dive even deeper next time.
Thanks for being part of the crew!
Listen now:
Apple: https://podcasts.apple.com/us/podcast/the-deep-dive/id1810950799
iHeartRadio: https://www.iheart.com/podcast/273511955/
Amazon: https://music.amazon.ca/podcasts/3a8f20eb-785d-4387-950a-9dfa19051c82/the-deep-dive
YouTube: https://youtube.com/playlist?list=PLyPRZ0NYmT_d0FNpc7zIWhkdSDdIFqoOk&si=sNFOegPEc8Kp_Rgt
Follow us:
Instagram: https://instagram.com/deepdive.main
Twitter: https://twitter.com/the_deepdive
Popular Podcasts
On Purpose with Jay Shetty
I’m Jay Shetty host of On Purpose the worlds #1 Mental Health podcast and I’m so grateful you found us. I started this podcast 5 years ago to invite you into conversations and workshops that are designed to help make you happier, healthier and more healed. I believe that when you (yes you) feel seen, heard and understood you’re able to deal with relationship struggles, work challenges and life’s ups and downs with more ease and grace. I interview experts, celebrities, thought leaders and athletes so that we can grow our mindset, build better habits and uncover a side of them we’ve never seen before. New episodes every Monday and Friday. Your support means the world to me and I don’t take it for granted — click the follow button and leave a review to help us spread the love with On Purpose. I can’t wait for you to listen to your first or 500th episode!
Stuff You Should Know
If you've ever wanted to know about champagne, satanism, the Stonewall Uprising, chaos theory, LSD, El Nino, true crime and Rosa Parks, then look no further. Josh and Chuck have you covered.
Dateline NBC
Current and classic episodes, featuring compelling true-crime mysteries, powerful documentaries and in-depth investigations. Follow now to get the latest episodes of Dateline NBC completely free, or subscribe to Dateline Premium for ad-free listening and exclusive bonus content: DatelinePremium.com