75
Days Away
A 48-hour, out-and-back endurance challenge run entirely inside an abandoned tunnel. Runners complete 63 out-and-backs through a 1.3-mile corridor, totaling just under 160 miles.
Race Day
Nov 20, 2026
Registration opens, price changes, race updates: straight to your inbox.
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
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Claim this race to manage registration, volunteers, and race-day ops on Endurance HQ.