In one run across the Straits of Gibraltar the subs would have been capable of smuggling more than 1,000 kilos (2,200 pounds) of cocaine from North Africa to Europe.
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The gang could also have been acting as tech providers for other crime groups around the world, said police.
Officers also seized 10 vehicles, some of them reportedly hollowed out with secret compartments for trafficking on land.
They said it was the first time they had ever seized drone submarines, also known as unmanned underwater vehicles (UUVs), in Spain.
The Spanish authorities suspect that the gang used UUVs “capable of bearing large loads” to transport drugs intended for distribution by other criminal groups.
The police said three UUVs were about to be delivered to a French criminal organization to “transport significant amounts of cocaine”, adding that the gang also had known customers in Denmark, Italy, and Spain.
The police said: “These devices could allow drug traffickers to transport large quantities of narcotics remotely across the Strait of Gibraltar.”
Each UUV had up to 12 motors and a maximum range of around 30 kilometers (18 miles), more than enough for the 15-kilometer (9-mile) crossing from Morocco to Spain.
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Spanish national police have dismantled a gang developing underwater drones to traffic drug through Gibraltar Strait, July 2022. (Zenger)
Meanwhile, the six “unmanned semi-submersible vessels” could each carry up to 200 kilograms (440 pounds) of drugs, according to the police.
The Spanish authorities seized eight kilograms (17.6 pounds) of cannabis, 145 kilograms (320 pounds) of hashish and 157,370 euros ($162,335) in cash.
They also confiscated 10 vehicles, and the six underwater drones during eight raids across Spain.
The country’s close proximity to Morocco – a major hashish producer – and its close ties with cocaine-producing former colonies in Latin America have made the country a key entry point for drugs bound for Europe.
Six of the eight suspects have been remanded in custody as the investigation continues.
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