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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.
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Sources:
https://oceanexplorer.noaa.gov/facts/dsl.html
https://www.discovermagazine.com/planet-earth/the-ocean-twilight-zones-mysterious-false-bottom
https://www.scientificamerican.com/article/greatest-migration-on-earth-happens-under-darkness-every-day/
https://www.frontiersin.org/articles/10.3389/fmars.2018.00259/full
https://twilightzone.whoi.edu/wp-content/uploads/2022/02/The-Ocean-Twilight-Zones-Role-in-Climate-Change.pdf
https://www.frontiersin.org/articles/10.3389/fmars.2022.782032/full
https://www.sciencedirect.com/science/article/pii/S0960982216313288
https://www.sciencedirect.com/science/article/pii/S0960982216313951
https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10606
https://www.mbari.org/undersea-robot-reveals-schools-of-animals-in-deep-scattering-layers/
https://www.frontiersin.org/articles/10.3389/fmars.2022.782032/full
https://www.iucn.org/resources/issues-brief/ocean-deoxygenation
https://twilightzone.whoi.edu/explore-the-otz/creature-features/lanternfishes/

Image Sources
https://www.gettyimages.com/detail/video/general-william-mitchell-troopship-turning-docked-stock-footage/545605866?phrase=40s%20ships
https://www.gettyimages.com/detail/video/radar-monitor-in-a-ship-stock-footage/1014493668?phrase=sonar
https://en.wikipedia.org/wiki/File:Static_image_of_sonar_data_scan.jpg
https://www.gettyimages.com/detail/video/cyclopoid-copepod-surrounded-by-daphnias-stock-footage/1316746364?phrase=marine%20microbes
https://oceanexplorer.noaa.gov/facts/dsl.html
https://www.gettyimages.com/detail/video/4k-video-footage-of-lanternfish-in-the-mediterranean-sea-stock-footage/1341701144?phrase=lanternfish
https://www.gettyimages.com/detail/video/big-group-of-sharks-swimming-at-reef-stock-footage/1362133734?phrase=predator
https://www.gettyimages.com/detail/video/bubbles-moving-underwater-stock-footage/997631072?phrase=deep%20sea
https://www.gettyimages.com/detail/video/underwater-night-life-shoal-of-fish-shining-in-stock-footage/1147535979?phrase=dark%20ocean
https://www.gettyimages.com/detail/video/copepod-in-freshwater-and-marine-under-microscope-stock-footage/1377416823?phrase=phytoplankton
https://commons.wikimedia.org/wiki/File:Animation_of_diel_migration.gif
https://commons.wikimedia.org/wiki/File:Marinesnow-splash.jpg
https://www.gettyimages.com/detail/video/4k-video-footage-of-bubbles-underwater-in-the-ocean-stock-footage/1389726786?phrase=water%20bubbles
https://www.gettyimages.com/detail/video/volvox-in-drop-of-water-under-the-microscope-for-stock-footage/1283271765?phrase=phytoplankton
https://www.gettyimages.com/detail/video/pieces-of-algae-float-in-blue-water-illuminated-by-sun-stock-footage/1405226026?phrase=phytoplankton
https://www.gettyimages.com/detail/photo/deep-blue-undersea-with-sunlight-ray-through-over-royalty-free-image/1193881593?phrase=deep%20sea
https://www.gettyimages.com/detail/video/closeup-of-atlantic-sea-nettle-jellyfish-slow-moving-stock-footage/1069163788?phrase=jellyfish