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>> SYSTEM LOG //
THE
WALKER
EXCAVATIONS
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ANCIENT ARTIFACTS
A unique exhibition showcasing strange objects from the depths of time
that has been dug up only to remain anomalies stuck in some fringe realm of history, and should not even exist at all
HANG SON DOONG
DESCRIPTION
Hidden deep within Vietnam’s Phong Nha–Kẻ Bàng National Park lies Hang Sơn Đoòng, the largest known cave in the world. For millions of years, its vast chambers, underground forests, and self-sustaining climate remained untouched, shielded by limestone walls and dense jungle.
Among its most mysterious features is a monumental stone disc discovered in the doline known as Watch Out for Dinosaurs. Overgrown with vegetation yet remarkably preserved, the structure bears engravings resembling those found on other Walker artifacts.
Its presence in such an isolated location has led scholars to suggest that an ancient settlement once stood above the cave, and that its people concealed their most sacred relics underground to protect them from impending catastrophe. Whether a prophecy or a warning, the Sơn Đoòng Monument remains one of the most enigmatic traces of a forgotten civilization.
DISCOVERY
Hang Sơn Đoòng is located in the Phong Nha–Kẻ Bàng National Park, Quảng Bình Province, in the central part of Vietnam, near the Laotian border. The cave lies within the Annamite Mountains, an ancient limestone karst range formed over 400 million years ago, making it one of the oldest geological formations on Earth.
The cave was first noted in 1990 by a local man, Ho Khanh, but remained “lost” until rediscovered in 2008–2009, when expeditions led to the first full exploration in 2009 under Howard Limbert and his team of British cavers.
DESCRIPTION
Sơn Đoòng is roughly nine kilometres long and encloses a total volume of about 38.5 million cubic metres — around five times larger than the famous Deer Cave in Malaysia. This makes it the largest known cave in the world by volume. For comparison, it could easily contain a 40-storey skyscraper or even an entire city block. Its main passage reaches up to 200 metres in height and 150 metres in width, dwarfing any other known cave passage.
The cave is believed to have formed between two and five million years ago through the erosive action of the Rao Thuong River, which still flows through parts of its chambers.
Its formations are colossal, with stalagmites rising over 70 metres high — one famously referred to as the “Hand of Dog.” Flowstones, cave pearls, and fossils of ancient sea creatures can also be found across its floors and walls.
Two vast dolines (collapsed cave ceilings), known as “Watch Out for Dinosaurs” and the “Garden of Edam”, allow sunlight to penetrate the depths. These create entire forests and a self-sustaining ecosystem within the cave itself. Trees reach up to 30 metres, and the humid, cool environment produces its own clouds, rainfall, thunder, and wind — an entire weather system enclosed underground.
The cave also harbours unique fauna, including venomous snakes and insects, bats, cave crickets, blind fish, and species still under scientific study.
Cave structure
Doline 1 - Watch Out for Dinosaurs
Doline 1 - Watch Out for Dinosaurs
Doline 1 - Weeding Cake
DOLINE 1 - THE WORLD OF DINOSAURS
The first doline lies about 3 km from the entrance of Son Doong and is the very first collapse chamber inside the cave. It was formed as the underground river carved out a vast passage through the limestone, creating towering corridors. In the section known as Watch Out for Dinosaurs, the limestone layers are thinner and structurally weaker. Over time, these fragile layers gave way, collapsing to create a long, narrow opening in the cave roof — while the chamber beneath remained immense.
At its widest point, Doline 1 measures about 125 meters across, according to the Son Doong map. Sunlight streaming through the slender opening above transforms the cavern into a natural cathedral of light. As the sun shifts across the sky, its beams travel along the cave passage, producing breathtaking scenes that change with each passing hour.
Ascending the hill into the first doline feels like stepping into another world. During the first exploration, the team had been discussing dinosaurs when, upon entering the doline, one of them jokingly remarked: “Watch out for dinosaurs!” The name stuck, and it perfectly captures the surreal atmosphere of the place. Surrounded by dense jungle thriving inside the cave, it is not difficult to imagine stumbling upon something primeval in this hidden landscape.
WEEDING CAKE
At the heart of the first doline stands a monumental stalagmite. Its surface has been flattened by countless years of waterfalls cascading from above, forming a structure composed of calcite rimstone dams and cave pearls. This striking formation has earned the nickname The Wedding Cake from visitors.
The site has become an iconic stop for nearly everyone who ventures into Son Doong. Here, tourists pause to take memorable photographs.
For reasons of safety and conservation, groups of ten must split into smaller teams to take turns climbing onto the Wedding Cake. From this vantage point, there is a remarkable view back toward the first campsite in the cave, The Level Playing Fields. Visitors can also simply stand still, watching leaves drift slowly from the doline’s rim or small waterfalls cascade from the ceiling above.
The doline sustains a surprising diversity of plant life, uniquely adapted to thrive in such a demanding environment. Sitting quietly here, surrounded by waterfalls, shafts of light, and resilient greenery, one cannot help but reflect on the incredible power of nature to create such a place.
LILY'S EXPEDITION TO SON DOONG
After her discovery of the remnants of a lost civilization known as the Ancient Walkers, #28300, also called Lily, continues her research with determination. Her newest lead comes from a mysterious painting with more to it than meets the eye. By applying techniques to reveal hidden layers in art, she manages to uncover a map beneath the paint — a secret pointing toward the unknown.
The map leads her to Vietnam, where, with the help of a few locals, she eventually finds the entrance to the Son Doong Cave deep within the jungle.
Lily begins to explore the vast cave system with her local guide, discovering more and more carvings and paintings along the walls — undeniable traces of the Ancient Walkers. Yet her curiosity drives her further. When her guide refuses to continue, warning her about the dangers that may lurk deeper inside, Lily decides to press on alone into the darkness.
After hours of exploration, she reaches two stone pillars she recognizes from her earlier research. Passing between them, she enters a massive chamber. Here she is certain: she has found a site of extraordinary importance to the Walker civilization, untouched for thousands of years.
Venturing deeper into the chamber, Lily comes upon a monumental structure. At its summit lies a great round stone tablet covered in intricate illustrations. She realizes what she has found — one of the legendary Prophecy Disks, left behind by the Ancient Walkers for future generations.
In this moment, everything falls into place. Visions overwhelm her mind, and for a fleeting instant she imagines the world as it must have been three millennia ago, alive with the presence of the Ancient Walkers. It feels as though she sees the past through their very eyes.
Now in possession of knowledge unknown to anyone else, Lily understands the magnitude of her discovery. This disk is only the beginning. There are eight Prophecy Disks in total, and she resolves to find them all. Without realizing it, she has stepped onto a path that will lead to revelations beyond imagination — discoveries powerful enough to reshape the future of humanity.
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