The Chasm of Doom

The Chasm of Doom is an unmarked, subterranean bouldering scramble in Joshua Tree National Park, requiring headlamps, tight crawls, and a flat-backed squeeze through a solid granite mountain.

The Chasm of Doom is an unmarked, subterranean scrambling route winding through a massive pile of White Tank monzogranite boulders in Joshua Tree National Park. Situated near the Hidden Valley Picnic Area, this off-trail passage is not a traditional water-carved slot canyon, but rather a complex, three-dimensional maze of voids and chambers created by giant, tumbled rocks. The entire transit spans only about 100 yards, yet navigating its dark, boulder-choked interior typically takes anywhere from thirty minutes to two hours. Step inside the initial cleft in the rock, and the intense Mojave Desert heat and blinding light quickly recede, replaced by a cool, gritty atmosphere and absolute darkness that demands a reliable headlamp.

Navigating the passage requires a physical sequence of scrambling, chimneying, and crawling. The journey begins with a steep scramble up through a narrow crack, which briefly opens to a high vantage point overlooking the surrounding rock formations. From there, the route backtracks and plunges into a dark, vertical shaft where hikers must chimney down, pressing their backs and feet against opposing rock faces. This leads directly to the crux of the entire adventure, an infamous obstacle known as the Coffin, or the Birth Canal. This horizontal slot is so tight that hikers must completely shed their backpacks and lie flat on their backs or stomachs, slowly shimmying feet-first through a granite gap that leaves only inches of clearance above the chest.

Preparation is critical for anyone attempting to squeeze through these geological joints. Standard hiking gear can be a liability here; backpacks will get stuck or shredded against the coarse granite, meaning water and headlamps should be carried in pockets or dragged along on a leash. Grippy approach shoes are highly recommended to maintain traction on the smooth, dusty rock surfaces, and long sleeves and pants help protect skin from inevitable scrapes. The route eventually terminates at the North Portal, where hikers squeeze through a final narrow opening and emerge blinking into the bright desert sun. Standing atop the boulders overlooking the Hidden Valley loop, the transition from the tight, silent grip of the earth to the vast, breezy expanse of the Mojave desert is incredibly stark.