Four U.S. cruise ship passengers were arrested in Bermuda after they were allegedly in possession of drugs powerful enough to sedate an elephant.

The Bermuda Police Service reported that passengers from Carnival Cruise Lines were detained after ship officials purportedly found them with “a substantial amount of illegal drugs and drug-related equipment.”

Bermuda police said that synthetic opioid carfentanyl, vape pens and suspected THC gummies were found in the passenger’s possession.

The Carnival Legend operates out of Baltimore. Police did not specify which ship was carrying the passengers who were arrested. (Carnival Cruise Lines Press Release)

Bermuda Police Service Acting Detective Superintendent Derricka Burns said carfentanyl is very powerful.

People visit Horseshoe Bay beach in Southampton, Bermuda, on Sunday, Nov. 15, 2020. (Nicola Muirhead/Bloomberg via Getty Images)

“Carfentanyl is about 100 times stronger than fentanyl and was originally used to sedate large animals like elephants. Even tiny amounts can be deadly. This seizure may have prevented a potential tragedy,” Burns said.

Fox News Digital reached out to Carnival Cruise Lines for comment.