Yes, cruise ships do have jails. Most large vessels carry a secure holding room, usually called the brig, where the captain can confine a passenger who threatens the safety of others until the ship reaches the next port and law enforcement takes custody. It is not a jail in the courthouse sense. It is a bare room meant to hold someone safely for a limited time, and the consequences of ending up there reach well beyond the voyage.
What the Brig Actually Is
The brig is typically a small, sparsely furnished room deep in the ship, in a crew-only area on one of the lower decks. It has a bed, a toilet, and little else. Some larger vessels have padded cells or more than one holding room for situations where a detainee is a danger to themselves.
Not every detention goes to the brig. For less severe situations, security may confine a passenger to their own stateroom with a guard posted at the door. Cabin confinement tends to be the first step. The brig is for cases where someone is violent, unpredictable, or has committed a serious crime and keeping them in a cabin is not enough to protect other passengers and crew.
The Captain’s Authority to Lock You Up
A cruise ship captain holds ultimate authority over everyone on board, and that includes the power to order confinement. Under longstanding maritime common law, a ship’s master can detain any person if the captain reasonably believes confinement is necessary to preserve order, discipline, or safety on board. Courts have required two things: the captain must actually believe the detention is necessary, and that belief must be objectively reasonable given the circumstances.
This authority exists independently of any contract. It is an inherent part of commanding a vessel at sea, where there is no option to call the police and wait ten minutes.
The ticket contract layers more rights on top. Every major cruise line’s passage contract reserves the right to confine any passenger who commits a crime on board until law enforcement can board or the ship reaches port, and to disembark a passenger at any port for violating shipboard rules, bringing drugs aboard, or any other breach of the agreement. The financial terms are blunt: if you are removed from the ship, you get no refund, you pay your own way home, and the cruise line can charge your onboard account for costs it incurs related to your removal.1Carnival Cruise Line. Cruise Ticket Contract
What Gets You Detained
The brig is reserved for conduct serious enough to endanger other people on board. Physical assault and sexual assault are the most common triggers. Significant theft, drug trafficking, and any behavior that threatens the vessel itself, such as a bomb threat or attempting to start a fire, will result in immediate detention. FBI reporting data from early 2025 shows that sexual assault and rape account for the largest share of serious crimes reported on cruise ships, followed by assault with serious bodily injury and thefts exceeding $10,000.2U.S. Department of Transportation. CVSSA Statistical Compilation January 1, 2025 – March 30, 2025
Financial fraud can also lead to detention, though not every fraud case involves the brig. Security may restrict a suspect’s movement or confine them to their cabin, depending on the threat they pose.
Inside the Detention
Once the captain orders confinement, security escorts the passenger to the brig or their stateroom. The detained passenger receives food, water, and medical attention if needed, and security monitors them continuously. This is a holding pattern, not a punishment phase.
While the person sits in the brig, the ship’s security team works the case. Federal law requires cruise ships to maintain video surveillance systems designed to document crimes and preserve prosecution evidence, with footage kept for at least 20 days. If the FBI gets involved, the cruise line can be required to preserve all relevant surveillance video for at least four years.3Office of the Law Revision Counsel. United States Code Title 46 – 3507 Passenger Vessel Security and Safety Requirements Crew receive federally certified training in crime prevention, evidence preservation, and reporting, so the on-board investigation is built to feed directly into a prosecution on land.
What Happens at the Next Port
On-board detention lasts only until the ship docks. The security team coordinates with local law enforcement or the FBI in advance, and the detained passenger is handed over when the ship arrives. Cruise lines operating from U.S. ports must report serious crimes to the FBI, including sexual assault, assault with serious bodily injury, theft over $10,000, homicide, kidnapping, suspicious deaths, missing U.S. nationals, and firing or tampering with the vessel.2U.S. Department of Transportation. CVSSA Statistical Compilation January 1, 2025 – March 30, 2025
Which country’s legal system handles the case depends on the circumstances. The FBI has jurisdiction over crimes at sea when the victim or perpetrator is a U.S. national on a voyage that departed from or will arrive in a U.S. port, when the ship is within U.S. territorial waters, or when the offense occurs on a U.S.-owned vessel in admiralty waters.4Federal Bureau of Investigation. Crimes Against Americans on Cruise Ships The legal foundation is 18 U.S.C. 7, which defines the “special maritime and territorial jurisdiction of the United States” to include the high seas and vessels connected to U.S. citizens or corporations.5Office of the Law Revision Counsel. United States Code Title 18 – 7 Special Maritime and Territorial Jurisdiction of the United States Federal penalties can be severe: sexual assault within special maritime jurisdiction carries penalties up to life in prison.6Office of the Law Revision Counsel. United States Code Title 18 – 2242 Sexual Abuse
The picture gets more complicated because most major cruise ships are registered in countries like the Bahamas or Panama, not the United States. Under international maritime law, the country where a ship is registered (its flag state) has regulatory authority over the vessel. In practice, when a U.S. citizen is the victim or perpetrator on a cruise departing a U.S. port, the FBI takes the lead regardless of the ship’s flag. If a crime involves only foreign nationals on a foreign-flagged ship in international waters, the flag state or the next port country may handle prosecution instead. Being disembarked at a foreign port does not mean you simply catch a flight home. You may be arrested, jailed, and prosecuted in a country you never planned to visit.
Consequences That Outlast the Voyage
The costs stack up quickly. Removal at the next port comes with no refund, no hotel, and no flight home.1Carnival Cruise Line. Cruise Ticket Contract Repatriation is your problem and your expense, and from a remote port that can be logistically difficult and costly.
Cruise lines also routinely impose lifetime bans, and those bans often extend to affiliated cruise lines under the same corporate umbrella. Criminal prosecution can follow long after the trip is over. If the FBI investigates, federal charges can be filed months after the voyage ends. The DOT publishes quarterly statistical reports on crimes reported under the Cruise Vessel Security and Safety Act, so incident data becomes part of the public record as well.7U.S. Department of Transportation. Cruise Line Incident Reports
If You Are the Victim, Not the Offender
The brig and the detention rules exist to deal with offenders, but federal law also protects passengers who are the victims of crimes at sea. Cruise ships must carry a security guide describing the medical and security personnel on board, how to report criminal activity, and the available law enforcement processes.8U.S. Department of Transportation. Passenger Cruise Ship Information You can contact the FBI or U.S. Coast Guard directly at any point during the voyage to report a crime, without going through the ship’s security team first.
Victims of sexual assault have additional rights under the Cruise Vessel Security and Safety Act, including free access to the ship’s internet and telephone services to contact law enforcement, legal counsel, and victim advocacy organizations.3Office of the Law Revision Counsel. United States Code Title 46 – 3507 Passenger Vessel Security and Safety Requirements The ship must have the equipment and trained staff to perform a forensic medical examination and preserve evidence. These requirements exist because a ship in open water is one of the most isolated environments a crime victim can be in, and delay in reporting or evidence collection can decide whether a case ever gets prosecuted.