( CNN ) -- Spanish authorities went fishing for backpacks full of cocaine and netted nearly a ton of the drug after uncovering what they say was a sophisticated undersea smuggling operation . The ring used packs equipped with a flotation system designed to keep them below the surface without sinking . Spain 's Civil Guard said Monday it has seized 37 of the packs , which were tagged with satellite tracking devices , with nearly 2,000 pounds ( 900 kilograms ) of cocaine inside . Smugglers had been using the submersible packs to smuggle the drugs between Malaga and Valencia , along the country 's Mediterranean coast , according to the Civil Guard , Spain 's national police force . Investigators had been tracking the suspects since May and made five arrests in those cities , it said . Authorities seized 72,000 euros ( $ 97,000 ) , three vehicles and an unspecified vessel in the raids . They also impounded jewelry and luxury watches , computer equipment and phones , the Civil Guard said . Police : High-end drug and prostitution ring busted on Super Bowl week .
Spain seized dozens of submersible backpacks full of cocaine . They had been used to smuggle cocaine along the Mediterranean coast . Five people were arrested in two hours as part of the raid .