The sheer volume of cocaine that comes out of the jungles of Colombia is enough to make traditional smuggling methods unworkable. So what did the geniuses of the cartels do? Built their own submarines. Narco-subs were first spotted in 1993 and have continued to be used to the present day. The boats can carry as much as 180 tons of cocaine, and are constructed from fiberglass to travel just below the surface. If one is spotted, the crew simply sinks the boat and abandons it to the bottom of the sea so there’s no evidence.