Supai Tunnel
The short section of tunnel blasted through the Supai Formation. On the other side of the tunnel is the Supai Tunnel rest station (with composting toilets and potable water).
This image is from the presentation "Desert Southwest - The Checklist Edition - Grand Canyon Rim-to-Rim Traverse, Day 3 - Cottonwood Campsite to North Kaibab TH".

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