Tom Harrisson was not a conventional archaeologist. The curator of the Sarawak State Museum arrived at Niah in October 1954 with two friends, Michael Tweedie and Hugh Gibb, and a theory built on observation rather than evidence. The cave showed no obvious signs of ancient habitation. But Harrisson noticed it was cool, dry, and swarming with millions of bats and swiftlets -- reliable protein sources for any hunter-gatherer community. If ancient humans had passed through Borneo, he reasoned, they would have stopped here. Two weeks of digging proved him right. He found evidence of long-term occupation, habitation debris, and burial sites. A larger expedition followed in 1957, backed by Brunei Shell Petroleum and Sarawak Oilfields, uncovering earthenware, shell scrapers, bone tools, and food remains. Then, in February 1958, came the Deep Skull itself. Subsequent expeditions in 1959, 1965, and 1972 pushed deeper into the sediment layers, revealing Neolithic burial sites dating from 2,500 to 5,000 years ago.

The Deep Skull triggered decades of controversy. In 1960, anthropologist Don Brothwell concluded it belonged to an adolescent male possibly related to indigenous Tasmanians, a finding that raised as many questions as it answered about migration patterns across ancient land bridges. Critics pointed to gaps in Harrisson's documentation -- insufficient paleogeography, unclear stratigraphy, ambiguous archaeological context. A redating effort in 2000 helped clarify the timeline, and studies published in 2006 confirmed human activity at Niah spanning from roughly 46,000 to 34,000 years ago. The cave's archaeological record runs remarkably deep: Pleistocene chopping tools and flakes, Neolithic axes and adzes, pottery, shell jewelry, boats, mats, and eventually iron tools, ceramics, and glass beads from the Iron Age. Nearby, the Painted Cave holds rock art dated to approximately 1,200 years ago, including depictions of what archaeologists interpret as death ships. In 2020, all 122 pieces of Niah human remains were repatriated to Sarawak from overseas collections.

Gunung Subis rises from the coastal lowlands of Miri Division, its limestone flanks pocked with caves and furred with vegetation. The park sits just 15 kilometers from the South China Sea and only 50 meters above sea level, placing it within a landscape of six distinct vegetation types identified by botanist Pearce in 2004: limestone karst scrub, mixed dipterocarp forest, seasonal swamp forest on both clay and peat soils, riparian corridors along waterways, and regenerating forest where older growth has been disturbed. The biodiversity is dense enough to earn Niah designation as an Important Bird Area. Walking the plankwalk trail from park headquarters to the cave mouth takes roughly 45 minutes through lowland rainforest that hums with insects and drips with humidity. The trail itself has become part of the experience -- the slow approach through dense canopy making the sudden scale of the Great Cave's entrance all the more dramatic when it finally appears.

Long before archaeologists arrived, the caves at Niah had an economy. Swiftlets build their nests from hardened saliva on the cave ceilings, and those nests -- the key ingredient in bird's nest soup -- command extraordinary prices across East Asia. Every section of ceiling where swiftlets roost is privately owned, and only the owner may harvest. Collection happens twice a year, typically in January and June. The method has barely changed: a collector climbs a single bamboo or belian pole, sometimes hundreds of feet, to scrape nests from the rock by flickering candlelight. It is dangerous, physically demanding work, performed in near-darkness at heights that would give most people vertigo. The nest trade predates European contact in Borneo by centuries and remains a significant source of income for local communities. Niah is a place where the deep past and the working present occupy the same physical space -- the same cave ceiling that sheltered human ancestors now feeds their distant descendants.