So called 'Narco Subs' started being used by drug smugglers in the 1990s. Most often, they aren't truly submersible, but are boats built and ballasted to sit low in the water and reduce their radar profile.
This waterline model is based upon the design nicknamed Bigfoot 2 by US Coast Guard and drug enforcement agencies. 18 metres long, it can carry around 6.4 tones of contraband.
