Unsolved Disappearance on Trail 9 and the Hidden Bunker Revelation in 2024

In 1995, during a routine hike, a young couple disappeared without a trace in the Sierra National Forest. Holly Mason Given and her husband Jacob left Yosemite’s Ridge Hollow on July 15th, leaving a trailmarked with a simple sun drawing and the note: “Looping north past Ridge Hollow. Returning Monday, just the two of us.”

No signs of struggle or calls for help emerged. The only clue was that their trail log ended at a weathered pine labeled “Tree 9.” Despite efforts, the case went cold, becoming one of many mysteries shrouded in the forest’s depths.

The Fire and the Discovery in 2024

In July 2024, a massive wildfire known as the “Signal Fire” ravaged 7,000 acres of Mariposa County, uncovering a concealed metal hatch on a scorched ridge near Tree 9. Firefighters initially suspected an old utility cover but instead found a bunker, with a charred tree bearing Roman numerals “IX.”

Sheriff Lena Bower, who had been a rookie when the Givens vanished, was called to investigate. Inside the bunker were a single sleeping bag, scorched journals, and a blue raincoat similar to Jacob’s. A human bone lay partially embedded in the soot, and a battered trail camera’s memory card survived the blaze.

The Trail Camera Footage and Hidden History

The FBI discovered photos from July 1995 showing Holly and Jacob alive beside Tree 9, with a shadowy figure approaching in the background — the last frame captured only the shadow. Inside the bunker, investigators found hundreds of tapes, journals, and a crawlspace lined with chains and padding. Walls marked with tally counts suggested ongoing experiments.

The Dark Past of Project Ardan

Among the recovered footage was a tape labeled “Exit Protocol v3.1,” revealing the bunker was part of “Project Ardan,” a Cold War-era psychological experiment conducted by covert government agencies. The purpose was to study the effects of isolation on hikers targeted near Tree 9, with a “Custodian” overseeing and manipulating the captives. Escape routes were sealed, with only a mysterious “backdoor protocol” giving a slim chance of freedom.

Holly’s Ordeal and Ongoing Mystery

Holly and Jacob survived underground for days. Jacob ultimately died during an escape attempt, but Holly, with help from another captive, Mara, managed to find and crawl through a hidden exit. She was found delirious, her story dismissed as trauma. However, her investigation led back to the bunker, which was now empty except for a fresh message carved into the bark: “Session 3 begins now.”

Uncovering the Web of Secrets

Post-fire evidence links Tree 9 to a network of underground chambers and secret facilities involved in these clandestine experiments, suggesting the scope extended beyond a single bunker. The fate of the “Custodian” and Mara remains unknown. Holly today receives anonymous tapes each July, revealing new victims and the chilling message: “Let’s begin again.”

The Roots Remain

With the trail now closed and the bunker sealed, the forest’s dark secrets endure. The investigation underscores a disturbing truth: some mysteries buried beneath the roots of Tree 9 continue to haunt the woods, warning explorers to tread carefully around these forgotten pathways.