There’s a lake so deadly that anything that goes for a swim gets pickled. Yet there’s a thriving ecosystem literally living on the edge, which might give astrobiologists a hint at how life could thrive on other worlds.

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Sources:
http://www.latimes.com/science/sciencenow/la-sci-sn-jacuzzi-death-brine-20161102-story.html
http://tos.org/oceanography/assets/images/content/29-1_supplement.pdf (pg 30-31)
https://www.seeker.com/deep-sea-brine-lake-dubbed-jacuzzi-of-despair-1777954783.html
http://www.nautiluslive.org/video/2015/06/01/brine-pool-hot-tub-despair

http://www.techtimes.com/articles/184535/20161102/jacuzzi-of-despair-underwater-lake-of-death-beneath-gulf-of-mexico-kills-creatures-that-swim-there.htm
https://www.mission-blue.org/2013/08/gulf-of-mexico-brine-pools-with-megan-cook/
https://blogs.scientificamerican.com/artful-amoeba/playing-in-a-deep-sea-brine-pool-is-fun-as-long-as-you-re-an-rov-video/
http://oceanexplorer.noaa.gov/explorations/02mexico/background/brinepool/brinepool.html
https://www.britannica.com/science/Callovian-Stage
http://www.whoi.edu/main/topic/hydrothermal-vents

https://www.nasa.gov/press-release/nasa-missions-provide-new-insights-into-ocean-worlds-in-our-solar-system

http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1758-2229.2011.00264.x/full (paywall)
http://www.annualreviews.org/doi/pdf/10.1146/annurev.marine.010908.163912 (paywall)
http://archives.datapages.com/data/bulletns/2013/10oct/BLTN12073/BLTN12073.HTM (paywall)
http://www.sciencemag.org/news/2012/05/barely-breathing-microbes-still-living-86-million-year-old-clay

Images:
https://en.wikipedia.org/wiki/Bioluminescence#/media/File:Bufoceratias.jpg
http://oceanexplorer.noaa.gov/explorations/02mexico/background/brinepool/media/gulf_salt.html
http://oceanexplorer.noaa.gov/technology/subs/hercules/hercules.html
https://en.wikipedia.org/wiki/Methane#/media/File:Methane-CRC-MW-3D-balls.png
https://commons.wikimedia.org/wiki/File:Hydrogen-sulfide-3D-balls.png
https://en.wikipedia.org/wiki/Brine_pool#/media/File:Brine_pool.jpg
https://www.nasa.gov/sites/default/files/images/543564main_pia07800-full_full.jpg
https://www.nasa.gov/mission_pages/cassini/multimedia/pia14658.html
https://upload.wikimedia.org/wikipedia/commons/4/4d/NOAAseep_600CratersBrinePools.jpg
http://www.dafont.com/metal-lord.font