Strategy Page has more information about the submarine factory that was recently discovered, and the boats they were constructing:
Colombian police recently arrested eighteen members of a gang that specialized in building submarines and semisubmersible boats for transporting cocaine from Colombia to Central America and Mexico. As police suspected, some (five) of those arrested were retired or on active duty with the Colombian Navy (which operates two 1970s ear German built Type 209 submarines). These arrests are part of an intense effort to find the people responsible for building subs for cocaine gangs. Find the builders, and you stop the building efforts.
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The submarines that have been captured have, on closer examination turned out to be more sophisticated than first thought. The outer hull is made out of strong, lightweight, Kevlar/carbon fiber that was sturdy enough to keep the sub intact, but very difficult to detect with most sensors. The hull could not survive deep dives, but this boat didn’t have to go deep to get the job done. The diesel-electric power supply, diving and surfacing system and navigational systems of captured (by the army, while under construction) subs were all in working order. It was believed that some of those who built these boats probably had experience building recreational subs. The sub builders also had impressive knowledge of the latest materials used to build exotic boats. It had already become clear that something extraordinary was happening in these improvised jungle shipyards.
The two fiberglass/Kevlar submarines found so far were obviously built to transport cocaine to North America. Neither the United States, nor anyone else who might know, are talking about how many of these subs are out there, or believed to be in operation or under construction. Similar type boats could be built for terrorist or espionage missions.
