Head to linode.com/scishow to get a $100 60-day credit on a new Linode account. Linode offers simple, affordable, and accessible Linux cloud solutions and services. On the briny sea, you're sometimes left wondering if that mass below your ship is the seafloor or a layer of fish so thick that your sonar thinks it's the seafloor. Hosted by: Michael Aranda (he/him) SciShow is on TikTok! Check us out at www.tiktok.com/@scishow ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Matt Curls, Alisa Sherbow, Dr. Melvin Sanicas, Harrison Mills, Adam Brainard, Chris Peters, charles george, Piya Shedden, Alex Hackman, Christopher R, Boucher, Jeffrey Mckishen, Ash, Silas Emrys, Eric Jensen, Kevin Bealer, Jason A Saslow, Tom Mosner, Tomás Lagos González, Jacob, Christoph Schwanke, Sam Lutfi, Bryan Cloer ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: scishow-tangents.simplecast.com/ Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Instagram: instagram.com/thescishow #SciShow #science #education ---------- Sources: oceanexplorer.noaa.gov/facts/dsl.html www.discovermagazine.com/planet-earth/the-ocean-twilight-zones-mysterious-false-bottom www.scientificamerican.com/article/greatest-migration-on-earth-happens-under-darkness-every-day/ www.frontiersin.org/articles/10.3389/fmars.2018.00259/full twilightzone.whoi.edu/wp-content/uploads/2022/02/The-Ocean-Twilight-Zones-Role-in-Climate-Change.pdf www.frontiersin.org/articles/10.3389/fmars.2022.782032/full www.sciencedirect.com/science/article/pii/S0960982216313288 www.sciencedirect.com/science/article/pii/S0960982216313951 aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10606 www.mbari.org/undersea-robot-reveals-schools-of-animals-in-deep-scattering-layers/ www.frontiersin.org/articles/10.3389/fmars.2022.782032/full www.iucn.org/resources/issues-brief/ocean-deoxygenation twilightzone.whoi.edu/explore-the-otz/creature-features/lanternfishes/ Image Sources www.gettyimages.com/detail/video/general-william-mitchell-troopship-turning-docked-stock-footage/545605866?phrase=40s%20ships www.gettyimages.com/detail/video/radar-monitor-in-a-ship-stock-footage/1014493668?phrase=sonar en.wikipedia.org/wiki/File:Static_image_of_sonar_data_scan.jpg www.gettyimages.com/detail/video/cyclopoid-copepod-surrounded-by-daphnias-stock-footage/1316746364?phrase=marine%20microbes oceanexplorer.noaa.gov/facts/dsl.html www.gettyimages.com/detail/video/4k-video-footage-of-lanternfish-in-the-mediterranean-sea-stock-footage/1341701144?phrase=lanternfish www.gettyimages.com/detail/video/big-group-of-sharks-swimming-at-reef-stock-footage/1362133734?phrase=predator www.gettyimages.com/detail/video/bubbles-moving-underwater-stock-footage/997631072?phrase=deep%20sea www.gettyimages.com/detail/video/underwater-night-life-shoal-of-fish-shining-in-stock-footage/1147535979?phrase=dark%20ocean www.gettyimages.com/detail/video/copepod-in-freshwater-and-marine-under-microscope-stock-footage/1377416823?phrase=phytoplankton commons.wikimedia.org/wiki/File:Animation_of_diel_migration.gif commons.wikimedia.org/wiki/File:Marinesnow-splash.jpg www.gettyimages.com/detail/video/4k-video-footage-of-bubbles-underwater-in-the-ocean-stock-footage/1389726786?phrase=water%20bubbles www.gettyimages.com/detail/video/volvox-in-drop-of-water-under-the-microscope-for-stock-footage/1283271765?phrase=phytoplankton www.gettyimages.com/detail/video/pieces-of-algae-float-in-blue-water-illuminated-by-sun-stock-footage/1405226026?phrase=phytoplankton www.gettyimages.com/detail/photo/deep-blue-undersea-with-sunlight-ray-through-over-royalty-free-image/1193881593?phrase=deep%20sea www.gettyimages.com/detail/video/closeup-of-atlantic-sea-nettle-jellyfish-slow-moving-stock-footage/1069163788?phrase=jellyfish