7 Unsolved Mysteries About the Deep Ocean

Despite decades of diligent research, there's still so much that we don't know about the deep sea. Join us for a new episode of SciShow as Hank Green takes you through seven unsolved mysteries about the deep ocean that will blow your mind!
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Sources:
The Ocean Floor
http://www.scientificamerican.com/art...
http://oceanservice.noaa.gov/facts/ex...
http://www.abc.net.au/news/2014-09-27...
http://www.nature.com/news/gravity-ma...
http://science.sciencemag.org/content...
https://www.ngdc.noaa.gov/mgg/bathyme...
http://www.slate.com/blogs/bad_astron...

Beneath the Seafloor
http://science.sciencemag.org/content...
http://science.sciencemag.org/content...
http://www.sciencemag.org/news/2015/0...
http://www.sciencedaily.com/releases/...

Brine Pools
http://oceanexplorer.noaa.gov/explora...
http://blogs.scientificamerican.com/a...
http://www.nautiluslive.org/blog/2014...
http://www.joyeresearchgroup.uga.edu/...

Milky Seas
http://biolum.eemb.ucsb.edu/organism/...
http://aem.asm.org/content/72/4/2295....
http://www.nrl.navy.mil/content_image...
http://www.pnas.org/content/102/40/14...
http://www.abc.net.au/news/2015-05-19...

Unidentified Sounds
http://oceanexplorer.noaa.gov/technol...
http://www.wired.co.uk/news/archive/2...
http://www.pmel.noaa.gov/acoustics/
http://www.pmel.noaa.gov/acoustics/so...
http://www.pmel.noaa.gov/acoustics/so...

The 52Hz Whale
http://www.pmel.noaa.gov/acoustics/wh...
http://www.nytimes.com/2004/12/21/sci...
http://www.smithsonianmag.com/smart-n...
http://www.slate.com/blogs/wild_thing...

Abyssal Gigantism
http://link.springer.com/article/10.1...
http://www.zmescience.com/science/bio...
https://universe-review.ca/R10-35-met...
http://jeb.biologists.org/content/215...