Unidentified Deep Sea Sounds Finally Explained by Marine Biologists

For years, mysterious sounds were recorded near the Mariana Trench that defied explanation... until now. A marine biologist reacts to the surprising origins of three previously unidentified sounds from the deep sea.

00:00 - Unexplained Deep Sea Sounds
01:37 - Why Marine Creatures Rely on Sound
03:34 - Biotwang Sounds From the Mariana Trench
05:07 - Biotwang Identified as Bryde's Whale
06:44 - Largest Unexplained Ocean Mystery is a Minke Whale
09:07 - The Bloop and Other Deep Sea Sounds
11:07 - The Bloop Was an Icequake
12:28 - Marine Biologist Reacts to Unidentified Deep Sea Sounds

Learn more about marine mammals and how they use sound!
The Evolution of Whales → https://youtu.be/NLaNg10F8Uk
Orca Echolocation → https://youtu.be/SRdHMG7mQ90
Can AI translate whale songs → https://youtu.be/RRbuQh3ClYc

These deep sea sounds are not man-made. Their acoustic signature is natural, and in many cases, biological. The most famous unidentified deep sea sound is The Bloop. A researcher at NOAA believed the sound profile resembled a living creature, with one crucial difference… it was so loud that it was picked up by underwater microphones across the Pacific, more than 3,000 miles apart. Making it one of the loudest sounds ever recorded. "Far more powerful than the calls made by any animal on Earth.”

The biotwang was originally recorded in 2014 near the Mariana Trench. At first, researchers couldn’t identify its source but they believed it was a marine mammal. Which might be surprising because the last section of the biotwang really does sound synthetic.

For decades, the bio-duck was recorded in the southern ocean but the animal producing it was a complete mystery. “The enigma surrounding the sound was further deepened by its discordant seasonal occurrence patterns.” The bio-duck can be heard year-round in the Antarctic. In the winter and spring, it occurs simultaneously in the eastern Weddell Sea and off Western Australia. This indicates it either has an extremely widespread distribution, or a year-round presence in Antarctic waters by one segment of the population and a seasonal migration pattern by another. One animal that fits this pattern, is the Minke whale...

Sources:
[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC4013705/
[2] https://pmc.ncbi.nlm.nih.gov/articles/PMC7657898/
[3] https://pmc.ncbi.nlm.nih.gov/articles/PMC5319310/
[4] https://pmc.ncbi.nlm.nih.gov/articles/PMC3952195/
[5] https://www.int-res.com/articles/meps/119/m119p001.pdf
[6] https://www.sciencealert.com/decades-ago-a-huge-noise-roared-in-the-ocean-for-years-it-was-a-mystery
[7] https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2019.00183/full
[8] https://www.worldwildlife.org/stories/a-whale-s-eye-view-of-antarctica
[9] https://www.theatlantic.com/video/index/543105/the-bloop-loudest-sound-ever-recorded-cara-cusumano/
[10] https://www.smithsonianmag.com/smart-news/mysterious-repetitive-quacking-noise-in-the-southern-ocean-may-have-been-a-conversation-between-whales-180985545/
[11] https://www.livescience.com/animals/whales/mysterious-sound-coming-from-the-mariana-trench-has-finally-been-explained
[12] https://en.wikipedia.org/wiki/List_of_unexplained_sounds
[13] https://pubs.aip.org/asa/jasa/article/140/3/EL274/649641/A-complex-baleen-whale-call-recorded-in-the
[14] https://cdn.oceanservice.noaa.gov/oceanserviceprod/facts/sofar.pdf
[15] https://dosits.org/science/movement/sofar-channel/sound-travel-in-the-sofar-channel/
[16] https://oceanexplorer.noaa.gov/gallery/sound/sound.html

Videos
[1] https://www.youtube.com/watch?v=BPIi2nkVBd4
[2] https://commons.wikimedia.org/wiki/File:The_first_test_launch_of_the_Hyunmoo_4-4_SLBM_of_the_Dosan_Ahn_Changho-class_submarine_in_September_2021.webm
[3] https://commons.wikimedia.org/wiki/File:Kolumbo-submarine-volcano-(Greece)-An-active-window-into-the-Aegean-subduction-system-srep28013-s3.ogv
[4] https://www.youtube.com/watch?v=bqCKwwdc47A
[5] https://www.youtube.com/watch?v=qqk8NZ_HYNw

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