A dark spot on the sea was enough to attract the attention of authorities near the island of Arousa (Spain) on Monday (13).
Suspecting something was amiss, Spanish authorities found an empty narco-submarine on site.
The "ghost submarine" found in Colombian waters brought to two the number of vessels seized this week that are used for drug trafficking.
The latest incidents draw attention to a tactic that is little talked about but has . . .
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