The VOID

The Void

The Void is a 48 hour out and back ultramarathon held inside Sideling Hill Tunnel near Valley Hi, PA. The course runs entirely on pavement within a 1.3 mile corridor; participants complete 63 out and back laps for a total just under 160 miles. The tunnel interior has no lighting, so runners navigate repeated stretches of darkness using headlamps.

The event emphasizes repetition, isolation, and self management rather than competition with others. The format offers regular opportunities to stop at the tunnel ends, creating frequent decision points about whether to continue. To structure those choices, organizers use a physical Toll Ticket system issued at check in. The ticket governs how often a runner may exit the tunnel to access support during the event; the system is intended to increase the psychological and strategic demands of the challenge.

Entry requires an application that is reviewed by the race directors. Priority is given to applicants with documented extreme endurance experience. Organizers recommend applicants have completed at least one 100 mile ultramarathon, backyard ultra, FKT, or comparable extreme endurance event within three years of registration. The field is capped at 96 participants. The event takes place inside a long abandoned turnpike tunnel with minimal scenery or variation, and it presents an emphasis on endurance, planning, and discipline. Visit the organization's website for the most recent information.

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