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U.S. Coast Guards have seized a submarine carrying 3.5 tons of cocaine in the Pacific Ocean off Costa Rica and arrested three Colombians on board, the Costa Rican Coast Guard said on Sunday.

The submarine appeared to be a makeshift vessel unlike military submarines or those used by oceanographers. It could only submerge 6 feet under water, Costa Rican Coast Guard spokesman Jose Antonio Fallas told Reuters.

The 45-foot-long vessel was found last Wednesday near the remote Coco Island, southwest of the Central American mainland, and had traveled hundreds of miles from Colombia on its way to the United States.