Cave Dweller

Does Sasquatch Live Underground? The Lava Tube Theory 

Of all the enduring mysteries surrounding the North American Sasquatch — and there are many, each more fascinating and more scientifically provocative than the last — perhaps none is simultaneously more practical, more testable, and more genuinely underexplored than the deceptively simple question of where, exactly, this creature spends the majority of its time. The popular imagination tends to picture Sasquatch as a perpetually wandering figure — striding through ancient forests, crossing remote mountain meadows, and occasionally stepping into the periphery of human awareness before melting back into the wilderness with the practiced ease of a creature that has been avoiding detection for a very long time. But this image, evocative as it is, may be fundamentally and significantly incomplete. What if the reason Sasquatch is so extraordinarily difficult to find is not merely because it moves through the forest with exceptional skill and caution, but because for the vast majority of any given day it is not in the forest at all — at least not the forest that exists above ground?

What if Sasquatch lives underground?
It is a hypothesis that deserves far more serious scientific attention than it has historically received, and at Sasquatch Syndicate we believe the accumulated weight of eyewitness testimony, physical evidence, geographic distribution data, and basic mammalian biology makes it not merely plausible but genuinely compelling. This article represents our most thorough and most carefully considered exploration of what we have come to think of as the Lava Tube Theory — the hypothesis that the North American Sasquatch uses the extraordinary and remarkably extensive network of volcanic lava tubes, sulfurous cave systems, and geothermal underground environments that honeycomb the geology of the Pacific Northwest as its primary habitat and refuge — retreating underground during the daylight hours and emerging above ground only under the concealing cover of darkness to forage, hunt, travel, and conduct whatever other activities above-ground life requires.

The Nocturnal Hypothesis — Why Daylight May Be Sasquatch's Enemy
Before we descend into the earth with our hypothesis, it is worth spending a moment examining the behavioral evidence for the proposition that Sasquatch is primarily, if not exclusively, a nocturnal creature — because the case for underground daytime habitation is substantially strengthened if the creature above ground is predominantly a creature of the night.

The eyewitness testimony record, when examined carefully and analytically rather than simply catalogued, reveals a striking and consistently underappreciated pattern — the overwhelming majority of the most credible, most detailed, and most thoroughly documented Sasquatch encounters occur either at dusk, during the hours of darkness, or in the very earliest moments of pre-dawn twilight. Daytime encounters exist, certainly, and some of the most famous and most extensively analyzed encounters in the research record — including the Patterson-Gimlin film of 1967 — occurred in daylight conditions. But the preponderance of the testimony points clearly and consistently toward a creature that is most active, most mobile, and most frequently observed when the sun is below or near the horizon and the concealing darkness of night provides its most effective natural protection against detection.

This pattern of predominantly nocturnal activity is, in itself, entirely consistent with what we know about the behavioral ecology of large mammals that have historically been subject to intensive hunting pressure or that have evolved in environments where avoiding detection by potential predators or competitors represents a significant survival advantage. Many of North America's largest and most behaviorally sophisticated mammals — including black bears, mountain lions, and wolves — have shifted substantially toward more nocturnal activity patterns in areas of significant human presence, a behavioral adaptation that represents a direct and measurable response to the pressures of human proximity. For a creature of Sasquatch's apparent intelligence and apparent awareness of its own vulnerability to human detection and documentation, a similar behavioral shift toward nocturnal activity would represent exactly the kind of adaptive response that we would expect from a large, intelligent mammal navigating an increasingly human-dominated landscape.

But here is where the biology becomes genuinely fascinating — and where it introduces a complication that the Lava Tube Theory is uniquely well positioned to resolve.

The Tapetum Lucidum Problem — Why Sasquatch May Not Be Built for the Dark
If Sasquatch is indeed a great ape or a close relative of the great ape lineage — as the preponderance of physical, anatomical, and behavioral evidence in the research record strongly suggests — then its nocturnal activity pattern presents a genuine and scientifically significant biological puzzle. The reason is straightforward and rooted in basic primate physiology: great apes, and indeed virtually all members of the primate order with the notable exception of certain prosimian species such as the tarsier and the aye-aye, do not possess the tapetum lucidum.

The tapetum lucidum — from the Latin for "bright tapestry" — is a specialized layer of reflective tissue located immediately behind the retina in the eyes of many mammals, most notably nocturnal hunters and animals that are active in low-light conditions. This tissue functions essentially as a biological mirror, reflecting light that has already passed through the retina back through the photoreceptor cells for a second pass — dramatically amplifying the eye's sensitivity to low levels of ambient light and providing the characteristic eyeshine that anyone who has shone a flashlight at a cat, a deer, or a raccoon in the darkness will immediately recognize. Animals with a well-developed tapetum lucidum — cats, dogs, deer, bears, raccoons, owls, and the vast majority of the world's dedicated nocturnal species — can see with remarkable clarity and detail in light conditions that would render a human being functionally blind. They are, in the most literal biological sense, built for the dark.

Primates are not. With the exception of the prosimian species mentioned above, members of the primate order — including all of the great apes, all of the Old World monkeys, all of the New World monkeys, and modern humans — lack the tapetum lucidum entirely. Primate visual systems evolved primarily for high-resolution, trichromatic color vision in the bright daylight conditions of the open forest canopy — a visual adaptation that serves primates extraordinarily well during the day and genuinely poorly at night. In darkness or near-darkness, a great ape's eyes are, by any objective physiological measure, significantly inferior to those of most other large North American mammals. A gorilla stumbling around a dark forest at midnight is, from a purely visual standpoint, at a significant disadvantage compared to the bears, mountain lions, deer, and other creatures sharing that forest — all of which possess the tapetum lucidum that the gorilla lacks.

And yet the eyewitness testimony record is full of accounts of Sasquatch moving through the forest in conditions of near-total darkness with apparent confidence, apparent ease, and apparent awareness of its surroundings that seems inconsistent with the visual limitations one would expect from a tapetum lucidum-lacking great ape navigating in the dark. How do we reconcile this apparent contradiction?

The Lava Tube Theory offers a genuinely elegant and scientifically coherent resolution — one that accommodates both the biological reality of primate visual limitations and the behavioral evidence of confident nocturnal movement. If Sasquatch spends the majority of the daylight hours in an underground environment characterized by near-total darkness — as the Lava Tube Theory proposes — then its eyes, like those of any animal that spends significant time in darkness, may have adapted over countless generations to function with greater sensitivity in low-light conditions than would be expected from a standard great ape visual system. Whether through the gradual physiological adaptation of existing photoreceptor cells, through behavioral compensations involving the use of other senses — most notably a highly developed sense of smell and acute tactile sensitivity — or through some combination of both, a creature that has spent millennia navigating underground environments in darkness would be expected to develop meaningful functional adaptations that partially compensate for the absence of a tapetum lucidum. Additionally, emerging from underground cave environments at dusk means transitioning to the surface precisely when ambient light levels are at their most tolerable for a vision system adapted to darkness — a behavioral pattern that would make excellent sense for a tapetum lucidum-lacking primate seeking to maximize its above-ground activity time while minimizing its exposure to the full intensity of daylight that its visual system handles least well.

It is also worth noting, in this context, the striking and consistently recurring detail in eyewitness testimony of apparent eyeshine in Sasquatch encounters — the characteristic reflective glow of eyes caught in artificial light that is the behavioral signature of the tapetum lucidum. Whether this reported eyeshine reflects an actual tapetum lucidum in Sasquatch — which would represent a significant and scientifically remarkable anatomical divergence from standard great ape physiology — or whether it reflects something else entirely, such as the highly vascularized fundus of an eye adapted for low-light conditions, or simply the reflection of ambient light from large, dark-adapted eyes in a way that witnesses interpret as eyeshine, remains genuinely uncertain. But the consistent reporting of this detail across geographically diverse and independently obtained eyewitness accounts is, at minimum, a data point worth taking seriously.

The Sulfur Connection — Following Your Nose to the Truth
If there is a single sensory detail in the Sasquatch eyewitness testimony record that most powerfully and most directly supports the Lava Tube Theory, it is not something that witnesses see or hear — it is something they smell. The overwhelming and remarkably consistent prevalence of sulfur-related odor descriptions in Sasquatch encounter reports — a penetrating, sharp, deeply unpleasant smell most frequently compared to rotten eggs, sulfurous hot springs, or the distinctive acrid odor of volcanic gas — represents one of the most intriguing and most genuinely informative recurring details in the entire body of eyewitness evidence. And when examined in the context of what we know about the geology, the geothermal activity, and the volcanic history of the Pacific Northwest, the implications of this consistently reported sulfurous odor point with striking directness toward underground environments permeated by volcanic gases and geothermal chemistry.

Hydrogen sulfide — the compound responsible for the characteristic rotten egg smell of sulfurous environments — is produced continuously and in significant quantities by the geothermal systems that riddle the geology of the Pacific Northwest from Northern California through Oregon, Washington, British Columbia, and Alaska. It is present in the steam vents, fumaroles, and hot spring outflows of every geothermally active area in the region. It permeates the air and the rock of cave systems in proximity to volcanic activity. And crucially, it is absorbed with remarkable efficiency and persistence into organic materials — including hair, skin, and clothing — that are exposed to it for extended periods of time. A creature that spends eight, ten, or twelve hours per day in an underground environment continuously permeated by low concentrations of hydrogen sulfide gas would be expected to carry the smell of that environment on its body with a thoroughness and a persistence that would make it detectable to human witnesses even in brief, fleeting outdoor encounters — which is precisely the pattern that the eyewitness testimony record describes.

The sulfur smell connection is, when examined carefully, one of the most powerful pieces of circumstantial evidence available for the Lava Tube Theory. It is a detail that is difficult to explain through any other hypothesis with comparable elegance and explanatory completeness. Why would a creature that spends all of its time above ground in the open forest consistently smell of sulfur? The forest itself, in the absence of nearby geothermal activity, does not smell of sulfur. Bear does not smell of sulfur. Decomposing organic matter produces its own distinctive odors, but they are not primarily sulfurous. The sulfur smell that witnesses consistently report is, by any reasonable analysis, most parsimoniously explained by regular, extended exposure to a geothermally active underground environment — which is precisely what the Lava Tube Theory predicts.

The Pacific Northwest Lava Tube System — One of the Most Extraordinary and Most Extensively Developed Underground Environments on Earth
To fully appreciate the plausibility and the explanatory power of the Lava Tube Theory, it is essential to understand just how extraordinary, how extensive, and how comprehensively developed the lava tube systems of the Pacific Northwest actually are — because the popular imagination almost certainly underestimates both the scale and the habitability of these underground environments. The Pacific Northwest of North America sits atop one of the most geologically active and volcanically productive regions on the face of the earth — a landscape shaped over millions of years by the relentless volcanic activity of the Cascade Range, the Columbia River Basalt Plateau, and the broader Pacific Ring of Fire, all of which have contributed to the formation of a lava tube network of almost incomprehensible extent and complexity that stretches, with varying degrees of continuity and accessibility, from the volcanic fields of Northern California all the way north through Oregon, Washington, British Columbia, and into Alaska.

Lava tubes form during volcanic eruptions when the outer surface of a flowing lava stream cools and solidifies while the molten interior continues to flow, eventually draining away and leaving behind a hollow tube of solidified basalt that can range in diameter from a few feet to — in the case of the largest and most spectacular examples — dozens of feet, and in length from a few hundred yards to many miles. The tubes are structurally stable, thermally insulated from the surface environment, and — in areas of ongoing geothermal activity — often permeated by warm air, steam, and the gases produced by the hydrothermal chemistry of the volcanic systems beneath them. They are, in the most literal sense, underground corridors — natural highways that allow a creature knowledgeable about their layout and extent to move through the landscape without ever appearing on the surface.

Northern California is home to some of the most extensively studied and most dramatically impressive lava tube systems in the entire Pacific Northwest. The Lava Beds National Monument in Siskiyou County alone contains more than seven hundred lava tube caves, many of them interconnected in complex multi-level systems that extend for miles through the volcanic plateau. The Modoc Plateau, which extends northward from Lava Beds into southern Oregon, is riddled with additional tube systems that have never been fully mapped or explored. The volcanic fields surrounding Mount Shasta — one of the most geologically active and most spiritually significant mountains in California, and a location with a remarkably rich and persistent tradition of large bipedal creature encounters stretching back centuries in the oral traditions of the indigenous peoples of the region — are permeated with lava tube systems of considerable extent, many of which are associated with sulfurous fumarolic activity that permeates the local geology with precisely the kind of hydrogen sulfide chemistry that the eyewitness testimony record associates with Sasquatch.

Moving north into Oregon, the scale and complexity of the lava tube systems expands dramatically. The High Lava Plains of central Oregon — a vast volcanic plateau stretching from the Cascade Range eastward toward the Great Basin — represent one of the most extensively lava-tube-rich geological environments anywhere in North America. The Newberry Volcano area near Bend contains some of the most spectacular and most extensively developed lava tube systems in the state, including the famous Lava River Cave — a single continuous lava tube more than a mile in length whose interior temperature remains a constant and remarkably stable 42 degrees Fahrenheit year-round regardless of surface conditions. This thermal stability is one of the most practically significant characteristics of lava tube environments from the perspective of a large mammal seeking reliable shelter from the dramatic and often brutal temperature extremes of Pacific Northwest winters — a point we will return to in detail shortly. The area surrounding Crater Lake — itself the caldera of the ancient volcanic giant known as Mount Mazama, which collapsed in a cataclysmic eruption approximately 7,700 years ago — is riddled with lava tube systems of considerable extent that connect through the volcanic geology of the southern Cascades with the systems to the north and south.

Washington State, sitting directly above the most seismically and volcanically active segment of the Cascadia Subduction Zone and home to active volcanoes including Mount Rainier, Mount St. Helens, and Mount Baker, is perhaps the single most geologically consequential state in the Pacific Northwest from the perspective of lava tube formation and geothermal cave system development. The area surrounding Mount St. Helens — whose catastrophic 1980 eruption dramatically and permanently reshaped the regional landscape and whose ongoing volcanic activity continues to generate new geothermal features — contains extensive lava tube systems both pre-dating and post-dating the 1980 eruption, some of which have never been fully explored. The Gifford Pinchot National Forest, which encompasses much of the volcanic terrain south of Mount Rainier, contains dozens of documented lava tube caves and an unknown but almost certainly substantial number of undiscovered or incompletely mapped systems in its more remote reaches. The area near the town of Cougar in Cowlitz County — itself one of the most persistently and consistently active Sasquatch encounter areas in the entire Pacific Northwest — contains multiple documented lava tube systems associated with the volcanic geology of Mount St. Helens. The connection between the geographic density of Sasquatch encounter reports and the geographic distribution of lava tube systems in Washington State is, when mapped carefully, a correlation that is difficult to dismiss as coincidental.

British Columbia adds yet another extraordinary dimension to the underground landscape available to a hypothetically cave-dwelling Sasquatch population. The volcanic fields of the Garibaldi Volcanic Belt, which extends northward from the Washington border through the Coast Mountains of southwestern British Columbia, contain lava tube systems associated with the recent volcanic history of peaks including Mount Garibaldi, Mount Meager, and the Silverthrone Caldera. The area around Radium Hot Springs in the Columbia Valley of southeastern British Columbia deserves particular attention in this context — a region where the collision of the Rocky Mountain geology with the volcanic history of the broader Pacific Northwest has produced a landscape of extraordinary geothermal richness, where hot spring systems permeate the local geology with warm, mineralized, and frequently sulfurous water that maintains the underground environment at temperatures dramatically more hospitable than the harsh surface conditions of a Rocky Mountain winter. The Kootenay National Park area surrounding Radium Hot Springs has been the site of numerous and persistent large bipedal creature reports over the decades, a pattern of encounter distribution that, when considered alongside the region's extraordinary geothermal geology, takes on considerable significance within the framework of the Lava Tube Theory.
​
And then there is Alaska — vast, remote, geologically extraordinary, and home to some of the most extensively developed and least explored volcanic landscapes anywhere on the surface of the earth. The volcanic systems of the Alaska Range, the Aleutian Arc, and the Wrangell Volcanic Field have produced lava tube systems of potentially extraordinary extent in some of the most remote and least accessible terrain in North America — terrain that has been subject to essentially zero systematic exploration for underground cave systems of the kind that the Lava Tube Theory predicts would serve as Sasquatch habitat. The Wrangell-St. Elias National Park and Preserve — the largest national park in the United States, encompassing more than thirteen million acres of largely unexplored wilderness — sits directly atop one of the most volcanically active geological environments in North America and almost certainly contains lava tube systems of considerable scale that have never been documented, explored, or mapped.

The Thermal Refuge Hypothesis — How Lava Tubes Solve the Winter Survival Problem
One of the most practically compelling and most scientifically coherent aspects of the Lava Tube Theory is its elegant resolution of what has always been one of the most puzzling and most difficult-to-answer questions in the entire field of Sasquatch research — the question of how a large, presumably non-hibernating primate manages to survive the extraordinarily harsh winters of the Pacific Northwest mountain ranges, where surface temperatures routinely drop well below freezing for months at a time, where snow accumulations render surface travel difficult or impossible for weeks or months on end, and where the food resources available to a large omnivore are dramatically reduced from their summer and autumn abundance.

The thermal properties of lava tube cave systems provide a remarkably complete and satisfying answer to this question. As noted in the discussion of Oregon's Lava River Cave above, the interior temperature of a well-developed lava tube system — insulated from the surface environment by meters of solid basalt and stabilized by the thermal mass of the surrounding rock — remains essentially constant year-round at a temperature that, while cool by human standards, is dramatically and consequentially warmer than the surface environment during the winter months. In a region where surface temperatures in the mountain ranges may drop to minus twenty degrees Fahrenheit or colder during severe winter weather events, the difference between a surface temperature of minus twenty and a cave temperature of forty-two degrees represents a thermal advantage of more than sixty degrees — an advantage that, for a large mammal with a high surface-area-to-volume ratio and significant metabolic demands, could represent the difference between survival and death.

In geothermally active cave systems — those permeated by warm water from sulfurous hot springs, by volcanic steam from fumarolic vents, or by the residual heat of volcanic activity in the underlying geology — the thermal advantage is even more dramatic and more consistent. The sulfurous hot spring systems that permeate the geology of the Pacific Northwest maintain underground temperatures in the caves and tunnels near their source that can range from comfortably warm to genuinely hot, creating underground microenvironments that remain hospitable to a large warm-blooded mammal through even the most severe winter conditions that the surface environment can produce. Sulphur Works in Lassen Volcanic National Park in Northern California, with its continuously active fumarolic vents and boiling sulfurous pools, maintains underground temperatures in adjacent cave systems that have been measured at significantly above ambient surface temperature year-round. The Sol Duc Hot Springs area of the Olympic Peninsula in Washington State — one of the most persistently and consistently active Sasquatch encounter areas in the entire Pacific Northwest, and an area with a remarkably rich tradition of large bipedal creature reports stretching back generations in the oral traditions of the Lower Elwha Klallam people — is underlain by an extensive system of sulfurous hot spring geology that permeates the local underground environment with precisely the kind of geothermal warmth and sulfurous chemistry that the Lava Tube Theory predicts would characterize Sasquatch's primary underground habitat.

The connection between sulfurous hot spring geography and Sasquatch encounter geography in the Pacific Northwest is, when examined systematically, one of the most striking and most consistently overlooked patterns in the entire distribution of eyewitness reports. A simple overlay of the geographic distribution of documented sulfurous hot spring systems across the Pacific Northwest with the geographic distribution of high-credibility Sasquatch encounter reports reveals a correlation that is, at minimum, far too consistent and too geographically precise to be dismissed without serious scientific consideration. The creature is most frequently and most credibly reported in precisely the areas where the underground thermal environments predicted by the Lava Tube Theory are most richly developed and most extensively distributed.

The Daily Cycle — A Proposed Model for Underground Living
Drawing together the behavioral evidence, the biological reasoning, the geological data, and the eyewitness testimony reviewed above, we can propose a coherent and internally consistent model for how a Sasquatch population living according to the Lava Tube Theory might structure its daily activity cycle — a model that accommodates and explains a remarkable range of the observations in the eyewitness testimony record that have previously resisted satisfying explanation.

During the daylight hours — particularly during the long, bright summer days of the high-latitude Pacific Northwest, where daylight may persist for sixteen hours or more — Sasquatch, according to this model, would be found primarily underground, resting in the thermally stable, visually protected, and geothermally warmed environment of a lava tube or sulfurous cave system. This underground resting period would serve multiple important functions simultaneously — providing thermal regulation, providing protection from detection, allowing recovery from the metabolic demands of the previous night's above-ground foraging activity, and providing the kind of safe, undisturbed rest environment that any large intelligent mammal requires for cognitive function and physical recovery.

As the sun descends toward the horizon and ambient light levels on the surface begin to drop toward the twilight threshold that a dark-adapted, tapetum lucidum-lacking primate visual system can navigate with reasonable effectiveness, Sasquatch would begin to stir — moving through the underground tube system toward one of the multiple surface access points that a well-developed lava tube network provides, emerging above ground into the transitional light of dusk, and beginning the above-ground phase of its daily activity cycle. This timing — emerging at dusk, operating through the hours of darkness and into the early pre-dawn period, and returning underground before the full intensity of daylight makes surface movement both visually challenging and detectably risky — would produce exactly the pattern of encounter timing that the eyewitness testimony record most consistently and most reliably documents.

Above ground, through the hours of darkness, Sasquatch would forage — covering potentially enormous distances through the forest in search of the diverse, high-calorie food sources that a large omnivore of its estimated body mass requires to sustain itself. Roots, tubers, berries, fungi, fish from forest streams, small mammals, deer fawns, carrion, insects, grubs, and whatever other nutritional resources the forest provides would all be plausible components of a generalist foraging diet. The olfactory capabilities of a creature that has evolved in an environment permeated by strong chemical signals — the sulfurous chemistry of geothermal environments, the complex scent landscape of a temperate rainforest — may be extraordinary by any standard, potentially providing navigational and prey-location capabilities that partially or fully compensate for the visual limitations that darkness imposes on a tapetum lucidum-lacking visual system.

As the pre-dawn sky begins to lighten and the forest transitions from the deep darkness of the middle of the night toward the growing luminosity of early morning, Sasquatch would retreat back toward its underground access points — moving with increasing urgency as the light intensifies, following the familiar underground network back to the resting chamber or chambers that serve as its primary shelter, and disappearing below ground before the full light of day makes surface visibility sufficient for reliable human detection. The result is a creature that is genuinely, systematically, and by behavioral design almost invisible to human observers — spending its above-ground hours precisely when human observation is least likely, and spending its underground hours in an environment that is physically inaccessible to casual human intrusion.

The Travel Network — Underground Highways of the Pacific Northwest
Perhaps one of the most intriguing and most practically significant implications of the Lava Tube Theory — one that has received relatively little attention in the broader discussion of this hypothesis — is the possibility that the extensive and often interconnected lava tube systems of the Pacific Northwest may serve not merely as localized shelter sites but as an actual underground travel network, allowing Sasquatch to move over considerable distances through the landscape without ever appearing on the surface.

Many of the most extensively developed lava tube systems in the Pacific Northwest are not isolated individual tubes but rather complex, branching, multi-level networks in which individual tubes connect to other tubes through collapsed sections, lava falls, and natural junctions, creating underground route systems of considerable geographic extent. A creature thoroughly familiar with the layout of such a network — as one would expect of a highly intelligent, long-lived species that has inhabited the same geographic territory across many generations — could potentially use that network to travel distances of miles through the landscape in complete concealment, emerging at surface access points strategically positioned relative to productive foraging areas, water sources, and other above-ground resources, and returning underground through those same access points before daylight makes surface presence detectably risky.

This underground travel network hypothesis provides a genuinely compelling explanation for one of the most persistently puzzling patterns in the Sasquatch encounter record — the way in which Sasquatch seems to appear and disappear with an abruptness and a completeness that defies the tracking capabilities of even experienced field researchers. A creature that does not flee through the forest when alarmed but rather descends into an underground access point and moves away through a lava tube network is, in the most literal sense, untrackable by surface methods — it vanishes not because it runs faster than its pursuers but because it moves through a dimension of the landscape that its pursuers cannot follow.

Conclusion — The Forest Above, the Labyrinth Below
The Lava Tube Theory is not, we want to be absolutely clear, a proven explanation for the Sasquatch phenomenon. It is a hypothesis — a carefully reasoned, internally consistent, and empirically grounded hypothesis, but a hypothesis nonetheless. What distinguishes it from mere speculation, in our view, is the remarkable degree to which it accommodates and explains a diverse range of observations from the eyewitness testimony record, the physical evidence record, and the biological and geological sciences that have previously resisted integration into any single coherent explanatory framework.

The sulfurous odor that witnesses consistently report. The predominantly nocturnal activity pattern that the encounter timing distribution documents. The apparent ability to disappear completely and instantaneously from areas that are subsequently searched without result. The correlation between high-credibility encounter geography and the distribution of geothermally active lava tube systems. The thermal challenge of surviving Pacific Northwest winters as a large, non-hibernating primate. The biological limitations imposed on nocturnal activity by the absence of a tapetum lucidum in a great ape visual system. All of these observations, taken individually, are interesting but inconclusive. Taken together, within the explanatory framework of the Lava Tube Theory, they form a pattern of mutually reinforcing evidence that is, we believe, genuinely worthy of serious scientific investigation.

The Pacific Northwest is riddled with ancient volcanic tunnels stretching from Northern California to Alaska — dark, warm, sulfurous, thermally stable, and almost entirely unexplored in their more remote reaches. If Sasquatch exists — and we at Sasquatch Syndicate believe with deep conviction that it does — the labyrinth beneath the forest floor may be exactly where it has been hiding all along.

Do you think Sasquatch lives underground? Have you encountered the sulfur smell in the field? Have you found cave entrances in your research areas that you believe warrant further investigation? We genuinely and warmly want to hear from you. Please share your experiences and your thoughts in the comments below or contact us directly at [email protected].

BELIEVE

​Written by Chuck Geveshausen, Founder — Sasquatch Syndicate Inc. — Covered under our Terms of Use.