Mammoth Cave Hydrologist Spills the Beans on What’s Swimming Below.
Donovan Dread
126,254 views
Under Mammoth Cave National Park in Kentucky, every dye trace for a century has run the same way: down through the sinkholes, through the dark, and out at the springs on the Green River. Then a cave hydrologist named Carla poured a pound of green dye into a farm sinkhole near Cave City, and six hours later it showed up inside the cave, upstream on Echo River, arriving in ninety-second pulses like a heartbeat.
Her second trace climbed two hundred yards against the current. So in February, with a storm coming up out of Tennessee and the base-level rivers rising, she went back down into the River Styx to save her instrument.
This is an original horror story set in real places: Mammoth Cave National Park, the Green River, Echo River, the River Styx, the sinkhole plain around Cave City, Park City, Turnhole Spring, River Styx Spring and the Historic Entrance. The history is real: more than 426 miles of surveyed passages, the Native people who explored the cave more than 5,000 years ago, the saltpeter works of the War of 1812 and the enslaved people who worked them, Stephen Bishop, the enslaved guide who crossed the Bottomless Pit and found the rivers, Frances Benjamin Johnston's 1891 flash photographs, the Kentucky cave shrimp, and Floyd Collins at Sand Cave in 1925. The Kentucky Geological Survey's dye-trace maps are real public data. Carla, Eli, Wendell and everything they found are fiction.
If your family ever rode the boats on Echo River before the tours ended, drop a comment with what the guide said and what the water looked like past the lantern.
Subscribe, because more than four hundred miles of that cave are mapped so far, and nobody's mapped where the rivers really go.
Satellite imagery: Powered by Esri. Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community. Terrain: Mapterhorn via Re:Earth terrain service (CC BY 4.0). Map data © OpenStreetMap contributors (ODbL). Sinkhole outlines and spring locations: Kentucky Geological Survey, University of Kentucky. Place names: USGS GNIS. Map engine: Gods Eye View by Bilawal Sidhu (github.com/bilawalsidhu/gods-eye-view).
Terrain: USGS 3DEP via AWS Terrain Tiles (Mapzen/Tilezen). Karst dye traces, groundwater basins, sinkhole outlines and 24K geology: Kentucky Geological Survey, University of Kentucky. Park boundary: National Park Service, Land Resources Division. Map data (c) OpenStreetMap contributors, ODbL.
Archive photographs: Library of Congress Prints & Photographs Division (Frances Benjamin Johnston, Mammoth Cave, 1891; Stephen Bishop engraving, 1882); Historic American Engineering Record, Mammoth Cave Saltpeter Works (HAER KY,31-MAMCA,1), Library of Congress; New York Public Library (stereographs by Mandeville Thum, 1876-77, and Ben Hains, 1889); Stephen Bishop's map of Mammoth Cave (1845 imprint), Tennessee State Library and Archives; H. C. Hovey and R. E. Call, Mammoth Cave of Kentucky (1897), via Internet Archive; Sand Cave, 1925, Spaarnestad Photo / Nationaal Archief. All public domain.
STORY DISCLAIMER: This video is an original work of fiction created for entertainment. The characters, dialogue, supernatural encounters, and story-specific events are invented and are not presented as verified accounts.
Real locations, historical background, and references to organizations are used as settings and context. Invented characters are not intended to depict actual employees or representatives of those organizations. Any resemblance to actual persons or their experiences is coincidental.
Any simulated testimony, reports, recordings, or documents appearing within the story are storytelling elements, not authentic evidence of the depicted encounter. AI-generated imagery and other dramatized visuals are illustrative and are not footage documenting that encounter.
No affiliation with or endorsement by any park, government agency, scientific institution, or other organization mentioned is claimed.
Copyright Notice
You must receive written permission from me to use any form of my content. reproduction of any of my narrations on any platform or medium is not allowed without prior written consent.
As an Amazon Associate I earn from qualifying purchases.
20 Comments
Well-done graphics too...!
As a caver myself, I appreciated how everything was informational, and true...!
Mammoth Cave Hydrologist Spills the Beans on What’s Swimming Below.
Donovan Dread
126,254 views
Under Mammoth Cave National Park in Kentucky, every dye trace for a century has run the same way: down through the sinkholes, through the dark, and out at the springs on the Green River. Then a cave hydrologist named Carla poured a pound of green dye into a farm sinkhole near Cave City, and six hours later it showed up inside the cave, upstream on Echo River, arriving in ninety-second pulses like a heartbeat.
Her second trace climbed two hundred yards against the current. So in February, with a storm coming up out of Tennessee and the base-level rivers rising, she went back down into the River Styx to save her instrument.
This is an original horror story set in real places: Mammoth Cave National Park, the Green River, Echo River, the River Styx, the sinkhole plain around Cave City, Park City, Turnhole Spring, River Styx Spring and the Historic Entrance. The history is real: more than 426 miles of surveyed passages, the Native people who explored the cave more than 5,000 years ago, the saltpeter works of the War of 1812 and the enslaved people who worked them, Stephen Bishop, the enslaved guide who crossed the Bottomless Pit and found the rivers, Frances Benjamin Johnston's 1891 flash photographs, the Kentucky cave shrimp, and Floyd Collins at Sand Cave in 1925. The Kentucky Geological Survey's dye-trace maps are real public data. Carla, Eli, Wendell and everything they found are fiction.
If your family ever rode the boats on Echo River before the tours ended, drop a comment with what the guide said and what the water looked like past the lantern.
Subscribe, because more than four hundred miles of that cave are mapped so far, and nobody's mapped where the rivers really go.
Satellite imagery: Powered by Esri. Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community. Terrain: Mapterhorn via Re:Earth terrain service (CC BY 4.0). Map data © OpenStreetMap contributors (ODbL). Sinkhole outlines and spring locations: Kentucky Geological Survey, University of Kentucky. Place names: USGS GNIS. Map engine: Gods Eye View by Bilawal Sidhu (github.com/bilawalsidhu/gods-eye-view).
Terrain: USGS 3DEP via AWS Terrain Tiles (Mapzen/Tilezen). Karst dye traces, groundwater basins, sinkhole outlines and 24K geology: Kentucky Geological Survey, University of Kentucky. Park boundary: National Park Service, Land Resources Division. Map data (c) OpenStreetMap contributors, ODbL.
Archive photographs: Library of Congress Prints & Photographs Division (Frances Benjamin Johnston, Mammoth Cave, 1891; Stephen Bishop engraving, 1882); Historic American Engineering Record, Mammoth Cave Saltpeter Works (HAER KY,31-MAMCA,1), Library of Congress; New York Public Library (stereographs by Mandeville Thum, 1876-77, and Ben Hains, 1889); Stephen Bishop's map of Mammoth Cave (1845 imprint), Tennessee State Library and Archives; H. C. Hovey and R. E. Call, Mammoth Cave of Kentucky (1897), via Internet Archive; Sand Cave, 1925, Spaarnestad Photo / Nationaal Archief. All public domain.
STORY DISCLAIMER: This video is an original work of fiction created for entertainment. The characters, dialogue, supernatural encounters, and story-specific events are invented and are not presented as verified accounts.
Real locations, historical background, and references to organizations are used as settings and context. Invented characters are not intended to depict actual employees or representatives of those organizations. Any resemblance to actual persons or their experiences is coincidental.
Any simulated testimony, reports, recordings, or documents appearing within the story are storytelling elements, not authentic evidence of the depicted encounter. AI-generated imagery and other dramatized visuals are illustrative and are not footage documenting that encounter.
No affiliation with or endorsement by any park, government agency, scientific institution, or other organization mentioned is claimed.
Copyright Notice
You must receive written permission from me to use any form of my content. reproduction of any of my narrations on any platform or medium is not allowed without prior written consent.
As an Amazon Associate I earn from qualifying purchases.