The cataphiles — exploring the forbidden underground
Cataphiles are urban explorers who slip into Paris’s vast, off-limits quarry network through hidden entrances, well beyond the small, secured section that forms the official Catacombs. Underground, they map tunnels, paint murals and hold gatherings — in 2004, police even discovered a fully fitted cinema built by one collective. A dedicated police unit patrols the network, because unauthorised entry there is illegal and genuinely dangerous.
Ask most visitors what lies beneath Paris and they’ll picture the Catacombs’ orderly bone walls. Ask a cataphile, and they’ll describe something else entirely: hundreds of kilometres of disused quarry tunnel, reached through drains and manholes, that only a small, determined subculture ever sees.
This guide explains who cataphiles are, what they actually get up to underground, and why what they do is a world apart — legally and physically — from a ticketed visit to the official Catacombs.
Who are the cataphiles?
“Cataphile” describes anyone who regularly, and unofficially, explores the wider quarry network beneath Paris — the roughly 200–300km of former limestone tunnels that the official Catacombs ossuary occupies only a small corner of. It’s less a formal club than a loose, decades-old subculture: photographers, artists, historians, students and plain thrill-seekers who share maps, meet underground and pass on routes by word of mouth.
Cataphiles generally avoid the ossuary itself, since it’s a monitored, ticketed site with its own security. Their interest is the rest of the network — the unlit, largely forgotten galleries that spread out beneath the Left Bank, connecting to nothing on any tourist map.
How they get in — and why it’s illegal
Cataphiles reach the tunnels through what they call chatières (narrow, hand-dug connecting passages) and a scattering of hidden entrances: manholes, sewer connections, service shafts and a handful of spots where the metro system runs close to old quarry galleries. Some routes are passed down for years within the community before being sealed off, at which point new ones are found or dug.
None of this is legal. Unauthorised entry into the quarry network has been banned since the mid-20th century, and the ban is actively enforced. Anyone caught underground without permission risks an on-the-spot fine, regardless of how experienced or well-prepared they consider themselves. The history of the Paris Catacombs traces how this same network was mapped and reinforced from 1777 for public safety reasons — reasons that still apply to the parts of it that remain closed today.
What cataphiles do underground
Once inside, cataphiles occupy themselves much like any close-knit subculture with a shared, secret space. Many focus on mapping: cross-referencing old quarry surveys against what they find, correcting or extending charts that officialdom never finished. Others paint murals on the quarry walls, several of which have built up a following of their own among regular visitors. Informal gatherings and parties are a fixture too, held deep in galleries that see no daylight and no supervision.
The underground cinema police found in the quarries
In September 2004, Paris police stumbled on a fully equipped cinema hidden inside a quarry chamber, complete with a large screen, tiered stone seating, a bar and restaurant area, and its own electricity and telephone lines. It had reportedly been built and used for years by a secretive collective of cataphiles known as “les UX” before officers found it, apparently by accident. It remains one of the best-documented stories of what this hidden subculture is capable of building.
The discovery made headlines well beyond France, partly because of how complete and long-running the setup turned out to be, and partly because nobody had reported it — the officers who found it are said to have come across it during a routine exercise, not a tip-off. It’s a striking illustration of how far cataphile projects can go, entirely out of sight of the authorities.
The police who patrol the quarries
A specialised police unit patrols the quarry network specifically to enforce the ban on unauthorised entry, nicknamed “cataflics” (a play on “cataphile” and the French slang for police, “flics”) by the community it exists to catch. Officers issue fines to anyone found underground without permission, and periodically seal off known entrances — though cataphiles are just as often reported to find or dig new ones.
Why the official Catacombs are a different experience
The official Catacombs visit is lit, ventilated, structurally monitored and staffed, with a fixed 1.5km route through the ossuary and a strict cap on numbers underground at any time. Cataphile exploration, by contrast, means unlit, unreinforced tunnels with no supervision, no facilities and no guarantee of a safe way out. One is a well-run heritage attraction; the other is an illegal activity with real risks attached.
Disorientation is the most basic danger — the wider network is a maze without signage, and even confident cataphiles have needed rescuing after losing their bearings. Flooding and partial collapses are real hazards in older, unmaintained sections, and mobile signal is unreliable or absent throughout. None of this applies to the official route, which is precisely why it’s the only way to see this underground world that doesn’t carry those risks. If you’re weighing up whether the ticketed visit is worth it at all, see our honest take on whether the Catacombs are worth visiting.
Frequently Asked Questions
What is a cataphile?
A cataphile is someone who regularly and unofficially explores the wider quarry network beneath Paris, beyond the secured official Catacombs. It describes a loose, long-running subculture rather than any formal group, bound together by shared maps, hidden entrances and word-of-mouth routes rather than membership of any kind.
Is it illegal to enter the Paris quarries without permission?
Yes. Unauthorised entry into the quarry network has been banned since the mid-20th century and is actively policed. Anyone caught underground outside the official Catacombs risks an on-the-spot fine, no matter their experience or intentions.
How do cataphiles get into the tunnels?
Through hidden entrances such as manholes, sewer connections and service shafts, plus narrow hand-dug passages known as chatières that link one section of the network to another. Routes are shared within the community and often close once discovered by police, prompting explorers to find or dig new ones.
Is cataphile exploration dangerous?
Yes. Beyond the official route, the tunnels are unlit, largely unreinforced and mapped only patchily. Disorientation, partial flooding and localised collapses are real risks, and mobile signal is unreliable throughout, which is why entering without a knowledgeable guide is considered genuinely hazardous.
What have police found in the quarries?
Alongside routine patrols and closures, one of the best-known discoveries came in September 2004: a fully fitted underground cinema, with a screen, stone seating, a bar and its own power and phone lines, built and used for years by a cataphile collective before officers found it.
Can tourists join cataphiles underground?
Not through any official channel, and it isn’t something this guide encourages. Entry to the wider network is illegal and unsupervised, with no safety standards, unlike the ticketed Catacombs visit. Anyone wanting to see this underground world safely should book the official route.
What’s the difference between the Catacombs and the quarries cataphiles explore?
The Catacombs is a small, secured, lit and monitored section of the same underground quarry network that cataphiles explore illegally elsewhere. One is an official heritage site with a fixed route and visitor cap; the other is unlit, unsupervised and off-limits.
Are there official tours of the wider quarry network?
No. Access is limited entirely to the official Catacombs ossuary and its approach tunnels. The remainder of the network, wherever cataphiles operate, is closed to the public with no legal way to visit, guided or otherwise.
