Spanish authorities described the network as one of the “largest criminal organizations specializing in maritime human trafficking in the Mediterranean.” Europol said the network it helped to dismantle “arranged storage, transport, refueling, maritime transfers, vessel maintenance, and counter-surveillance services” for other smuggling gangs. Video released by Spanish authorities showed police arresting suspects and counting large stacks of 50 euro bills found during their searches. Four of the network’s alleged leaders were among those arrested, the Civil Guard said. “They used extremely violent methods to protect the vessels and resist law enforcement,” the Civil Guard added.