The U.S. Coast Guard urges South Florida recreational boaters considering transiting toward Cuban territorial waters to “not take to the sea.”

Boaters are prohibited to depart from the United States with the intent of transiting to Cuba for any purpose without a permit, and the waters are in the Florida Straits are unpredictable and dangerous, according to the Coast Guard.

Vessels and persons illegally entering Cuban territorial waters or getting underway or departing from U.S. territorial waters with the intention of entering Cuban TTW, without the required permit may be subject to seizure of their vessel, civil and criminal penalties up to $25,000 per day, and 10 years in prison. People who violate U.S. immigration laws and illegally bring foreign nationals into the country, or who attempt to do so, may be subject to arrest, vessel forfeiture, civil and criminal fines up to $250,000 per day, and five years in prison.