Fiberglass four-man craft is typical of recent LPVs. Seized by Steadfast in the Eastern Pacific. Source: Dvids
The website “Covert Shores” has a couple of posts that purportedly show the latest fashion in drug smuggling vessels, here and here. Some great photos.
Might also find this interesting, “Narco Sub 101”
Covert Shores has been added to my “Recommended Blogs” list.
Chuck Hill's CG Blog 
As I recall the USS Monitor was a Semi-Submersible Vessel. But technology “Kermar 16”, owned by Kerr-McGee Oil and Gas, was the First Semi-Submersible (i.e. “Out-of-Line-of-Sight” Vessel) built in 14 November 1947 and operated of the Louisiana Coast…
The USS Monitor was not a semi-submersible vessel. She was just designed with a very low freeboard
The Revenue Cutter Service had a semi-submersible ironclad during the Civil War. http://coastguardnews.com/revenue-cutter-naugatuck-the-coast-guards-ironclad/2015/04/04/
I didn’t know that! Any good Books on the Subject worth noting…
Sorry, that is all I know about it. The Coast Guard had a similar telling of the story, but it is no longer accessible.
Thanks! But I’ll try any way! Most of what I find is by Serendipity, looking for something else…
Photos of two more intercepted low profile vessels. http://www.hisutton.com/Narco_2018-09.html
Low Profile Vessel seized by Guatemalan Navy. http://www.hisutton.com/Narco_2018-11.html