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Entering or exploring a cave: what the law allows

Last reviewed: August 30, 2026VerifiedDRNA

In short

Act 111-1985 declares it public policy to protect and conserve the caves, caverns and sinkholes of Puerto Rico for their formations of natural materials, their fauna adapted to the underground environment, their archaeological and historical value, for being conductors and receptacles of underground water flow and for providing an environment suited to recreation and scientific research. It defines a cave or cavern as a natural cavity, niche, chamber or series of chambers and galleries below the earth’s surface, and a sinkhole as a usually circular hole in karst areas. It treats as owner both the owner of the plot where the cave sits and the owner of the plot where the access sits. Article 4 prohibits eight acts constituting a misdemeanour punishable by up to six months’ imprisonment or a fine of up to five hundred dollars: damaging or defacing natural material; removing or transporting it; killing, harming or removing animals or plants; altering the natural atmosphere, clarifying that entering or remaining in a cave is not a violation; entering carrying aerosols or containers with paint or dye; forcing locks, gates or doors even if entry is not achieved; selling, exchanging, donating or exporting natural material or archaeological evidence; and contaminating, diverting or altering the water. Damaging archaeological evidence — petroglyphs, pictographs, ceramics, bones or tools — carries imprisonment of six months to five years or a fine of one hundred to two thousand five hundred dollars. Leaving rubbish carries a fine of five to fifty dollars or one day in jail for each dollar left unpaid. Building over caves or underground rivers posing a risk is prohibited without the Secretary’s prior endorsement, as is using caves for septic wells, effluent discharges or raising animals. Article 7 permits six activities with the prior written consent of the Secretary and of the owner, it being understood that even the owner needs the Secretary’s consent. The Secretary may impose administrative fines of up to ten thousand dollars.

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What is it?

Puerto Rico has one of the most remarkable cave systems in the Caribbean, and this is the Act that says what may and may not be done inside them. The first thing worth knowing, because it is reassuring: entering a cave is not, by itself, a violation of this Act; Article 4 itself says so expressly. The second, which surprises many people: if you are going to do more than enter and look — take samples, study, excavate, install anything, use the water or the bat guano — you need the written consent of the Secretary of Natural Resources and of the landowner, and the Act says that even if you are the owner you need the Secretary’s. And the third, which is worth the whole Act: scratching a wall, taking a stalactite or moving a petroglyph are offences, and the archaeological-evidence one reaches five years.

Who can do it?

The prohibitions reach every person, with no exception for being the landowner: the Act defines “Person” as any natural or juridical person, public or private, and any grouping of them. For the permitted activities in Article 7, whoever requests them needs two written consents — that of the Secretary of Natural and Environmental Resources and that of the owner of the plot where the cave or the access sits — and for archaeological excavations they additionally need the prior written authorisation of the Institute of Puerto Rican Culture. The Act sets no training, federation, insurance or experience requirement for entering a cave.

Requirements

Documents you need

Information pending verification.

Cost

Check the current cost with the official agency.

Step by step

  1. Step 1: Entering is not an offence, and the Act says so

    It is worth starting there because it is the commonest doubt. Article 4(a)(4) prohibits altering the cave’s natural atmosphere, including burning any material producing smoke or gases harmful to animals and plants, and closes with an express clarification: “provided that the fact of entering or remaining in a cave, cavern or sinkhole does not constitute a violation of this article.” That is, the Act does not criminalise the visit itself. What it criminalises is what you do inside.

  2. Step 2: The eight prohibited acts

    Article 4(a) lists them and each is a misdemeanour, punishable by imprisonment of no more than six months or a fine of no more than five hundred dollars, or both, at the court’s discretion. First, breaking, cracking, sculpting, painting, writing, marking or in any way damaging, destroying or defacing natural material. Second, removing or transporting natural material. Third, killing, harming, disturbing or removing any animal or plant. Fourth, altering the natural atmosphere. Fifth, entering carrying any aerosol or other container holding paint, dye or colouring matter. Sixth, breaking, forcing, removing or damaging any lock, gate, door or structure designed to prevent entry — and note this: the Act punishes it “regardless of whether the person manages to enter or not.” Seventh, offering for sale, exchange or donation, selling, exchanging, donating, exporting or by any method disposing of natural material or archaeological evidence taken from a cave. Eighth, contaminating, diverting or in any way altering the water.

  3. Step 3: What counts as “natural material”

    More than it seems. Article 3(d) defines it as any deposit, concretion or mineral formation in a cave, cavern or sinkhole, and includes — without limitation — stalactites, eccentric stalactites, stalagmites, columns, flowstone, draperies, calcite crystals, fans, calcite dams, cave pearls, bat guano and the droppings of living organisms. And it adds a sentence that decides many cases: “provided that the walls, floors and ceilings of caves, caverns or sinkholes are considered natural material.” In other words, scratching a wall is damaging natural material.

  4. Step 4: The penalty that rises: archaeological evidence

    Article 4(b) stands apart from the rest. Any person who wilfully alters, removes, transports or in any way damages any archaeological evidence or features found in a cave, cavern or sinkhole — including, without limitation, petroglyphs, pictographs, ceramics, bones and tools — shall be sanctioned with imprisonment for a minimum term of six months and a maximum of five years, or a minimum fine of one hundred dollars and a maximum of two thousand five hundred. It is the Act’s most severe provision and the reason archaeological excavations require, on top of the Secretary and the owner, the prior authorisation of the Institute of Puerto Rican Culture.

  5. Step 5: The rubbish, and its curious fine

    Article 4(c) deserves separate mention for how it is drafted. Depositing or leaving in a cave food, containers, ropes, electric batteries, carbide, papers, wrappers, rubbish, debris or any waste is a misdemeanour, sanctioned on a first infraction “with a fine of no less than five dollars and no more than fifty, or one day in jail for each dollar left unpaid.” The batteries and carbide are named on purpose: they are typical caving residues.

  6. Step 6: What may be done, and with what permits

    Article 7 lists six activities and sets the two-consent rule: they may be carried out “with the prior written consent of the Secretary of Natural Resources and of the owner of the plot or farm where the cave, cavern or sinkhole sits or where the access or accesses to be used to enter them sit; it being understood that even being the owner one must have the Secretary’s written consent.” The six: carrying out scientific studies and taking samples of water, air, fauna, flora and natural materials; removing or protecting any organism, animal or plant for disease or contamination and to prevent spread; carrying out archaeological studies and excavations and removing evidence for scientific and pedagogical purposes, with the Institute of Culture’s prior authorisation; using and exploiting the waters and the droppings of living organisms or bat guano; building, developing, installing, using and administering physical facilities for scientific, public, tourist or commercial purposes; and carrying out work to properly conserve the resource.

  7. Step 7: The extra requirement for installing anything inside

    The fifth activity in Article 7 — building, developing, installing, using and administering physical facilities, tourist and commercial ones included — carries an additional test worth knowing before investing: “to authorise this activity it must be demonstrated that it is more useful to the community than keeping the cave, cavern or sinkhole in its natural state.” The compilation writes “mis” where it evidently meant “más”; we flag it and do not correct it on our own account. The burden of demonstrating that greater usefulness falls on the applicant.

  8. Step 8: If you own land with a cave on it

    Three things touch you directly. First: Article 4(d) prohibits the development of residences, industries, structures and other buildings founded over caves, caverns or sinkholes and underground rivers that constitute a risk to community health or safety, to the preservation of the caves and to the contamination of those water bodies, without the Secretary’s prior endorsement. Second: Article 4(e) prohibits, without exception and with no permit possible, using caves, caverns or sinkholes for building septic wells, for discharging domestic and industrial effluents, and for raising animals that could affect these ecosystems. Third: if you oppose the conservation work in Article 7(f), the Department will go to court to obtain an order permitting the steps aimed at cleaning.

  9. Step 9: The administrative fines, separate from the criminal side

    Article 6 gives the Secretary a route running parallel to the courts: they may issue orders to do or not do, cease and desist, and — after holding hearings — impose sanctions or administrative fines up to a maximum of ten thousand dollars for infractions of the Act, its regulations or the orders issued under them. Article 10 provides that this money, together with that from permits requested under the Act, goes to a special account in Treasury to be used by the Department of Natural Resources in executing this Act.

Where to do it

The written consent is given by the Secretary of the Department of Natural and Environmental Resources, whom Article 5 charges with implementing the Act and adopting the regulations. For archaeological excavations the prior written authorisation of the Institute of Puerto Rican Culture is additionally needed. The landowner’s consent — or that of the access plot’s owner — is arranged with that person directly. The Act publishes no form, address or portal, and we do not guess government internet addresses.

How long it takes

Check the current processing time with the official agency.

What to do if something goes wrong

What we did not read and therefore do not publish: the regulation Article 5 orders the Secretary to prepare and approve, with a deadline of 1 January 2009; Act 416-2004 on environmental public policy to which Article 9 refers for environmental impact statements; and the amending acts 366-2000 and 200-2007 that the compilation’s cover identifies. Without the regulation we cannot say how consent is requested, on what form, what it costs or how long it takes. An imprecision in the compilation itself that we prefer to flag rather than correct: Article 7(e) says it must be demonstrated that the activity “is mis useful to the community,” where it evidently meant “more useful”; we reproduce the phrase and note the typo. Five gaps in the text, said clearly. First, Article 10 expressly mentions money from “the permits requested” but the Act publishes no charge: we do not know whether it costs anything or how much. Second, it sets no term for the Secretary to answer a consent request. Third, it creates no review or appeal of its own against a refusal or an administrative fine. Fourth, it does not list which caves are covered: it reaches caves, caverns and sinkholes generally, on public and private land alike. Fifth, it requires no training, insurance or federation to enter. Cost and time are unverified for the first and second reasons. A note on acquired rights: Article 8 respects the rights or interests of those who, when the Act was approved, were carrying out commercial activities in caves, with the exception of raising animals, and requires any later improvement or expansion to be in harmony with this Act.

Common mistakes

  • Believing entering a cave is illegal: Article 4(a)(4) expressly clarifies that entering or remaining is not a violation.
  • Thinking owning the land exempts you: the Act says that even being the owner you need the Secretary’s written consent.
  • Carrying aerosols or containers with paint: entering with them is, by itself, one of the eight prohibited acts.
  • Believing scratching a wall is not damaging natural material: the Act treats walls, floors and ceilings as natural material.
  • Underestimating the penalty for petroglyphs: damaging archaeological evidence reaches five years’ imprisonment.
  • Forcing a gate thinking nothing happens if you do not get in: the Act punishes it regardless of whether you manage to enter.
  • Leaving batteries or carbide inside: they are expressly named in the prohibition on depositing waste.
  • Assuming you can install a tourist facility with only the owner’s permission: you must demonstrate it is more useful to the community than the cave in its natural state.
  • Using a sinkhole as a septic well or for discharges: it is prohibited without exception and with no permit possible.

Frequently asked questions

Do I need a permit to enter a cave?

The Act clarifies that entering or remaining in a cave does not by itself constitute a violation. What does require the written consent of the Secretary and the owner are the six activities in Article 7, such as taking samples, studying, excavating or installing facilities. Access across private land additionally depends on that land’s owner.

Can I take a stalactite?

No. Removing or transporting natural material is one of the eight prohibited acts in Article 4(a), and stalactites are named in the definition of natural material. Selling, exchanging, donating or exporting it is another separate prohibited act.

How much are the fines?

Criminally, the eight acts in Article 4(a) are a misdemeanour with up to six months’ imprisonment or a fine of up to five hundred dollars. Damaging archaeological evidence reaches five years or two thousand five hundred dollars. Administratively, the Secretary may impose up to ten thousand dollars.

I have a cave on my farm. Can I build over it?

Article 4(d) prohibits building over caves, caverns, sinkholes and underground rivers that constitute a risk to community health or safety, to the preservation of the caves or to the contamination of those water bodies, without the prior endorsement of the Secretary of Natural Resources.

Who authorises an archaeological excavation in a cave?

Three authorisations are needed: the written consent of the Secretary of Natural Resources, that of the owner of the plot or the access, and the prior written authorisation of the Institute of Puerto Rican Culture required by Article 7(c).

Official sources

These are the government pages this guide is based on.

Last verified

August 30, 2026

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