Six men were arrested in the Netherlands after Dutch police discovered a “torture chamber” built into a series of sea containers. The chamber had reportedly been soundproofed and was stocked with pliers, scalpels, and handcuffs. Arrests were reportedly made before it could be used on any potential victims.

While the arrests were announced on Tuesday, the chamber was initially discovered in June based on information collected from encrypted messages sent between criminals. It was an international effort, as the messages were cracked by French police starting in 2017, with British and Dutch detectives pursuing the leads generated by them.

Police were tipped off to the existence of this structure after several of the decrypted messages included photos of dental chairs and restraint belts, as well as mentions of a “treatment room.” One container housed several bags full of torture implements, including hedge clippers.

“Six of the containers were intended as cells in which people could be tied up and one container was intended as a torture chamber,” Andy Kraag, head of the Dutch police’s National Investigation Service, explained in a statement.

Rotterdam police also discovered what they believe to be a base of operations that included police uniforms, drugs, stolen cars and 25 guns.

Hundreds of other suspects have been arrested across Europe based on these messages, of which there were reportedly millions. The arrests have also led to the seizure of 8,000 kilograms of cocaine and 1,200 kilograms of crystal meth.

“This is a great result of the 26Lemont investigation,” Kraag said. “And, take it from me, many more results will follow.”

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Representational image Getty Images/Jonathan Alcorn