Here we are. We've examined arctic explorers, secret armies, zany daredevils, Wisconsin whiz kids and so many more only to come up empty. This is the end of the rope. Can we solve the mystery of The Foolkiller, the submarine discovered in the Chicago River in 1915, or is this one just meant to be a mystery forever. Stick around and find out. Get a free trial of The Great Courses Plus and three months of unlimited access for just $30 dollars by going to https://www.thegreatcoursesplus.com/theconstant (https://www.thegreatcoursesplus.com/theconstant)Get 10% off your first month of online counseling by visiting:http://betterhelp.com/theconstant (http://betterhelp.com/theconstant) and entering discount code "theconstant".Finally, there's www.industrialartifacts.net (https://www.industrialartifacts.net/) where you can enter coupon code "theconstant" for 15% off your first order.Visit our Patreon here (https://patreon.com/theconstant).For more information, photos and video related to this episode, go to constantpodcast.com (https://www.constantpodcast.com/)Music by:Blue Dot Sessions (https://www.sessions.blue/)Lee Rosevere (https://leerosevere.bandcamp.com/)Kevin MacLeodAnimeistrash Voice talent from:Chad The Bird of Chad The Podcast (http://www.chadthebird.com/chadthepodcast)Sebastian Major of Our Fake History (https://ourfakehistory.com/)Bilal Dardai of Unwell: A Midwest Gothic Mystery (https://www.unwellpodcast.com/)Jake Barton of Historium (https://www.orbitaljigsaw.com/podcasts/historium/)Chelsey Weber-Smith of American Hysteria (https://www.patreon.com/americanhysteria)Zachary Davis of Ministry of Ideas (https://www.ministryofideas.org/)Tamar Avishai of The Lonely Palette (http://www.thelonelypalette.com/)Wade Roush of Soonish (https://www.soonishpodcast.org/)Charles Gustine of Iconography (https://iconographypodcast.squarespace.com/)Kavita Pillay of Subtitle (https://subtitlepod.com/)Phil Ridarelli of The Neo-Futurists (https://neofuturists.org/)And Heather Chrisler (http://www.heatherchrisler.com/) of Virtually (https://www.writerstheatre.org/the-last-match?gclid=CjwKCAiAzJLzBRAZEiwAmZb0akRD3Qy2l3rI9P6YZ1e-UMKSaNHIe3qYEIB445KJ2ppNCFc8UXI8HBoCyfYQAvD_BwE&gclsrc=aw.ds) Everything Oh God She's Cool (https://firstfolio.org/?production=louisa-may-alcotts-little-women)

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