The VOID
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The Void
The Void is a 48-hour endurance event held inside Sideling Hill Tunnel in Valley-Hi, PA on November 20, 2026. Runners complete repeated out and back trips along a paved tunnel corridor to cover just under 160 miles.
- 1.3-mile corridor
- 63 out and back laps
- Just under 160 miles total
The tunnel has no interior lighting, so participants rely on headlamps and carry on through repeated darkness. The course is a simple out and back on pavement with no scenery or variation; runners turn at a cone and return along the same route.
The event uses a physical Toll Ticket system that limits how often a runner may leave the tunnel to access support. The system is designed to introduce strategic and psychological constraints on leaving the course; success depends on endurance, planning, discipline, and the ability to resist exiting.
Entry requires an application reviewed by race directors. Priority is given to applicants with documented extreme endurance experience. The organizers recommend applicants have completed at least one 100-mile ultramarathon, backyard ultra, FKT, or a comparable extreme endurance event within three years of registration. The field is limited to 96 participants. The event is organized by ESTEA. Visit the organization's website for the most recent information.
