There has been a report that the Colombians are purchasing two subs from Germany, and that “The U206s are critical to Colombia’s fight against the drug gangs’ semi-submersible vessels.”
I also see a need for ASW assets to deal with the problem, but the Type 206A subs are tiny, slow, and old enough to be Coast Guard Cutters (They have crossed the Atlantic for exercises). The newest entered service in 1975. Their systems have been updated, they do have passive detection systems, but there have got to be easier and cheaper ways to detect drug subs and self propelled semi-submersibles.
It will be interesting to see how they are actually used. If this does work, will the Coast Guard get their own subs?