Spanish authorities have confiscated 11 tons of cocaine and arrested 20 people in two different operations against the smuggling of the illegal drugs inside shipping containers, Spain’s National Police said Tuesday.

Police said that 7,500 kilograms of cocaine seized by agents in the northwestern city of Vigo were hidden between pieces of frozen tuna. Investigators said that a criminal organization was using a frozen seafood company as a front to bring the drugs from South America to Spain.

A separate sting by police in the Mediterranean city of Valencia led to the seizure of 3,400 kilograms of cocaine found in false bottoms of shipping containers in the eastern city’s port.

Police didn’t reveal the exact dates of the operation, only indicating that they had been carried out recently. They said both rings were linked to criminal organizations from the Balkans region.

General Motors Co. is partnering with a manufacturer of mining and construction equipment to co-develop a hydrogen fuel cell power module for a mining truck, the company said Tuesday.

GM, with its Hydrotec hydrogen fuel cell operation, and Komatsu, a global manufacturer of mining and construction equipment, will jointly design and validate the technology that will be used for Komatsu’s 930E electric drive mining truck, the companies said.

GM and Komatsu expect to test the first prototype Hydrotec-powered mining vehicle in the mid-2020s at Komatsu’s Arizona proving grounds. The vehicle will be powered by more than 2 megawatts of Hydrotec power cubes.

The announcement comes after GM last week announced it signed a joint development agreement with Autocar Industries LLC to create vocational vehicles powered by GM’s Hydrotec hydrogen fuel cell power cubes.