The Running Channel Podcast 142: Sarah Ran A Marathon In A Mine & Tom's Terrified About His First Ultra
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Nov 1, 2025 Sarah shares her adventurous experience running a marathon 1,300 meters underground in Sweden, including the challenges of heat, humidity, and pitch darkness. She even set a new Guinness World Record! Meanwhile, Tom discusses his training for his first ultramarathon, detailing the ups and downs of carrying a heavy pack and adjusting his nutrition. The hosts ponder the legitimacy of run-walk strategies and the growing buzz around indoor treadmill racing. It’s a blend of epic feats and relatable running talk!
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Running A Marathon 1,000+ Metres Underground
- Sarah described descending by lift and minibuses to reach a thousand metres deep mine with offices and vehicles underground.
- She ran laps in a drilled exploration tunnel with ventilation tubes and high humidity, earning a deep-marathon medal and a piece of zinc.
Hot, Humid Tunnels With High-Tech Safety
- Sarah recalled the mine conditions: 24–28°C with 60% humidity making runners damp and sweaty.
- The event used strong pumped ventilation and live Wi‑Fi positioning tags for safety and streaming.
Pacing And The Mental Cost Of Lap Racing
- Sarah ran 11 laps of a 4km loop and started at a solid 4:05/km pace for the first 10 miles.
- She faded later to average 4:42/km and finished fourth female, highlighting the mental challenge of repetitive laps.