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https://www.guinnessworldrecords.com/news/2026/3/runners-strap-headlamps-on-to-tackle-deepest-marathon-over-3000-ft-underground
Runners strap headlamps on to tackle deepest marathon over 3,000 ft underground | Guinness World...
Mar 11, 2026 - The world's deepest marathon took place over 3,000 ft underground.
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https://www.worldsdeepestmarathon.com/
The World's Deepest Marathon | Taking running to another level
The World's Deepest Marathon is a record breaking challenge to run a full marathon, 1,120 meters below sea level.
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https://www.gold.org/news-and-events/press-releases/get-set-worlds-deepest-marathon
Get set! World’s Deepest Marathon set to make history with two Guinness World Record attempts and...
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