A maze of flooded passages, narrow crawls, unstable ceilings and human remains gives this expedition an inherently unsettling atmosphere long before the story begins layering on missing explorers, hostile underground residents and curses. The strongest material comes from the physical journey itself: squeezing between rock and metal, wading through rising water, descending between levels and navigating passages where the group repeatedly admits it could not retrace its route alone. Those moments communicate the scale and discomfort of the environment far more effectively than the constant insistence that something even worse may be waiting ahead.
The central mystery concerns an explorer said to have disappeared in 1993 after leaving behind a camera, with the group attempting to retrace possible routes through wall paintings, bone tunnels and increasingly obscure lower levels. The investigation gives the trip a useful narrative structure, but the evidence remains thin. Old and newly painted “white men” markings become difficult to distinguish, several theories end in dead ends, and nothing discovered conclusively establishes what happened to the missing person. The ending appropriately stops short of claiming that the mystery has been solved, although much of the buildup encourages viewers to expect a more definitive discovery.
Presentation is heavily driven by escalating danger. Cataphiles are described as people who may destroy cameras, steal lights, deploy smoke bombs or deliberately strand outsiders, while encounters with other explorers are repeatedly framed as possible threats before usually proving uneventful. Claims about people “hunting outsiders,” suffocating smoke attacks and explorers disappearing forever are presented dramatically without enough supporting detail to determine how common or well-established those dangers really are. The result is effective suspense, but viewers should separate the crew's fearful interpretation from facts actually demonstrated during the expedition.
The human remains provide some of the most memorable and uncomfortable imagery. A bone well, scattered skulls and a so-called bone throne give the lower tunnels a disturbing physical presence, while the group occasionally pauses to acknowledge that these are the remains of real people rather than horror props. Other historical statements, including ages assigned to bones, the origins of burial practices, supposed centuries-old rituals and the connection between the baptism room and a monastery, are largely delivered through the guide and treated as established background without supporting evidence. The material therefore works better as reported underground lore than as documented history.
Several sequences also strain the seriousness of the exploration. The elaborate crawl that turns into a Revolut advertisement is an inventive sponsorship transition, but inserting a financial promotion into one of the tightest and most anxiety-driven sections abruptly breaks immersion. The bone throne “curse” similarly leans into supernatural theater despite the host acknowledging that he does not normally believe in curses. These choices fit the channel's entertainment-first style, yet they blur the line between documenting a dangerous environment and constructing a horror narrative around it.
The final descent is the most effective section because the uncertainty feels genuine. With the guide remaining behind, a long rope serving as the only clear route back and the host entering an unmapped area alone, the stakes become understandable without additional embellishment. Strange objects, sounds and apparent movement are left unresolved, and the creator ultimately concedes that he found nothing that solved the disappearance. That restraint salvages some credibility after the more sensational earlier claims and leaves the catacombs themselves—not an invented revelation—as the expedition's most compelling subject.
Pros
- The flooded passages, tight crawls, unstable sections and multi-level navigation create strong tension through real environmental obstacles.
- Following several possible routes connected to the missing explorer gives the three-day expedition a clear narrative purpose.
- The final descent into an unmapped level is visually and psychologically effective without requiring a manufactured solution to the mystery.
- The group occasionally reflects on the human reality of the remains rather than treating every bone solely as horror scenery.
Cons
- Claims about hostile cataphiles, disappearances, smoke attacks and underground rituals are often presented with little evidence beyond the guide's statements and the crew's interpretation.
- Constant escalation and ominous narration sometimes exaggerate uncertainty into implied danger before encounters or discoveries have actually established it.
- The investigation produces no strong evidence about the missing explorer, leaving much of the mystery structure speculative.
- The extended sponsorship gag and supernatural framing around the bone throne interrupt the otherwise immersive expedition.
The expedition is most convincing when darkness, exhaustion, confined spaces and uncertain navigation are allowed to create tension on their own. Its missing-person investigation never develops enough evidence to support the larger mythology surrounding the tunnels, but the physical journey remains gripping, visually distinctive and appropriately unresolved.
