Narco Sub, Size XXL

Forbes brings us an article by blogger H I Sutton (Covert Shores), probably the best unclassified source on maritime smuggling technology in the English language, reporting discovery of an exceptionally large self propelled semi-submersible seized by Colombian forces before it could sail. The mystery is why so large and what was it expected to do? My guess–going to the Western Pacific for transshipment somewhere in Oceania.