Tunnel Ultra: The mind-bending 200-mile ultra-marathon in the dark - BBC Sport

One runner was chased by monsters. Another went blind. In the darkness, nothing is as simple as it seems.

Tunnel Ultra: The mind-bending 200-mile ultra-marathon in the dark

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The Tunnel 200 Mile Ultra Marathon Timelapse Photos of Runners

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The Tunnel 200 Mile Ultra Marathon Timelapse Photos of Runners

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The Tunnel 200 Mile Ultra Marathon Timelapse Photos of Runners

Tunnel Ultra: The mind-bending 200-mile ultra-marathon in the dark